The Modern JavaScript Tutorial

How it's done now. From the basics to advanced topics with simple, but detailed explanations.

Table of contents

Main course contains 2 parts which cover JavaScript as a programming language and working with a browser. There are also additional series of thematic articles.

The JavaScript language

Here we learn JavaScript, starting from scratch and go on to advanced concepts like OOP.

We concentrate on the language itself here, with the minimum of environment-specific notes.

  • An Introduction to JavaScript
  • Manuals and specifications
  • Code editors
  • Developer console
  • Hello, world!
  • Code structure
  • The modern mode, "use strict"
  • Interaction: alert, prompt, confirm
  • Type Conversions
  • Basic operators, maths
  • Comparisons
  • Conditional branching: if, '?'
  • Logical operators
  • Nullish coalescing operator '??'
  • Loops: while and for
  • The "switch" statement
  • Function expressions
  • Arrow functions, the basics
  • JavaScript specials
  • Debugging in the browser
  • Coding Style
  • Automated testing with Mocha
  • Polyfills and transpilers
  • Object references and copying
  • Garbage collection
  • Object methods, "this"
  • Constructor, operator "new"
  • Optional chaining '?.'
  • Symbol type
  • Object to primitive conversion
  • Methods of primitives
  • Array methods
  • Map and Set
  • WeakMap and WeakSet
  • Object.keys, values, entries
  • Destructuring assignment
  • Date and time
  • JSON methods, toJSON
  • Recursion and stack
  • Rest parameters and spread syntax
  • Variable scope, closure
  • The old "var"
  • Global object
  • Function object, NFE
  • The "new Function" syntax
  • Scheduling: setTimeout and setInterval
  • Decorators and forwarding, call/apply
  • Function binding
  • Arrow functions revisited
  • Property flags and descriptors
  • Property getters and setters
  • Prototypal inheritance
  • F.prototype
  • Native prototypes
  • Prototype methods, objects without __proto__
  • Class basic syntax
  • Class inheritance
  • Static properties and methods
  • Private and protected properties and methods
  • Extending built-in classes
  • Class checking: "instanceof"
  • Error handling, "try...catch"
  • Custom errors, extending Error
  • Introduction: callbacks
  • Promises chaining
  • Error handling with promises
  • Promise API
  • Promisification
  • Async/await
  • Async iteration and generators
  • Modules, introduction
  • Export and Import
  • Dynamic imports
  • Proxy and Reflect
  • Eval: run a code string
  • Reference Type
  • Unicode, String internals
  • WeakRef and FinalizationRegistry

Browser: Document, Events, Interfaces

Learning how to manage the browser page: add elements, manipulate their size and position, dynamically create interfaces and interact with the visitor.

  • Browser environment, specs
  • Walking the DOM
  • Searching: getElement*, querySelector*
  • Node properties: type, tag and contents
  • Attributes and properties
  • Modifying the document
  • Styles and classes
  • Element size and scrolling
  • Window sizes and scrolling
  • Coordinates
  • Introduction to browser events
  • Bubbling and capturing
  • Event delegation
  • Browser default actions
  • Dispatching custom events
  • Mouse events
  • Moving the mouse: mouseover/out, mouseenter/leave
  • Drag'n'Drop with mouse events
  • Pointer events
  • Keyboard: keydown and keyup
  • Form properties and methods
  • Focusing: focus/blur
  • Events: change, input, cut, copy, paste
  • Forms: event and method submit
  • Page: DOMContentLoaded, load, beforeunload, unload
  • Scripts: async, defer
  • Resource loading: onload and onerror
  • Mutation observer
  • Selection and Range
  • Event loop: microtasks and macrotasks

Additional articles

  • Popups and window methods
  • Cross-window communication
  • The clickjacking attack
  • ArrayBuffer, binary arrays
  • TextDecoder and TextEncoder
  • File and FileReader
  • Fetch: Download progress
  • Fetch: Abort
  • Fetch: Cross-Origin Requests
  • URL objects
  • XMLHttpRequest
  • Resumable file upload
  • Long polling
  • Server Sent Events
  • Cookies, document.cookie
  • LocalStorage, sessionStorage
  • Bezier curve
  • CSS-animations
  • JavaScript animations
  • From the orbital height
  • Custom elements
  • Template element
  • Shadow DOM slots, composition
  • Shadow DOM styling
  • Shadow DOM and events
  • Patterns and flags
  • Character classes
  • Unicode: flag "u" and class \p{...}
  • Anchors: string start ^ and end $
  • Multiline mode of anchors ^ $, flag "m"
  • Word boundary: \b
  • Escaping, special characters
  • Sets and ranges [...]
  • Quantifiers +, *, ? and {n}
  • Greedy and lazy quantifiers
  • Capturing groups
  • Backreferences in pattern: \N and \k<name>
  • Alternation (OR) |
  • Lookahead and lookbehind
  • Catastrophic backtracking
  • Sticky flag "y", searching at position
  • Methods of RegExp and String
  • If you have suggestions what to improve - please submit a GitHub issue or a pull request instead of commenting.
  • If you can't understand something in the article – please elaborate.
  • To insert few words of code, use the <code> tag, for several lines – wrap them in <pre> tag, for more than 10 lines – use a sandbox ( plnkr , jsbin , codepen …)
  • © 2007—2024  Ilya Kantor
  • about the project
  • terms of usage
  • privacy policy

Learn JavaScript - A Free 7-hour Interactive Tutorial

Over the last four months, I have recorded what is probably the most interactive JavaScript course that has ever been created.

The reason I have done this is because I often see new coders fall into the same pitfalls again and again when trying to learn JavaScript, with the most dangerous ones being these three 👇

  • Not being able to go from watching JS tutorials to building JS projects 🛠
  • Losing motivation because they get bored 🥱
  • Not being able to move forward because the learning curve is too steep 🧗

However, very few courses seem to take these pitfalls seriously enough. So this course is meant for anyone who has experienced any of the above issues when learning JavaScript.

In this article, I'll explain how the course works so that you can decide whether or not you think it is something for you.

Alternatively, you can simply start watching the entire course right here from inside this article. Just click on the play button in the embedded screencast below 👇

Why Hyper Interactivity is Important

The course is built around 140+ interactive challenges. This means that there's no point in binge-watching it. The whole purpose of it is to get you to code, to build up your JavaScript muscle memory. And in order to achieve that, you must solve the challenges.

Don't worry though – each challenge is byte-sized and fast to solve, so you will feel like you are progressing quickly.

This level of interactivity would be clunky to achieve using regular videos, as you would need to jump between the video player and the code editor 140+ times throughout the course. Not to mention opening up new starter files for many of the challenges.

To combat this issue, I created this course using Scrimba, which makes the experience much smoother.

When you are inside a scrim, you can instantly jump between watching the teacher's explanation and coding up your own solution.

Imagine if VS Code and the video format had a child. That's Scrimba. You can both watch the tutorial and edit with the code inside the same frame.

People often struggle to understand what a scrim is before they've seen it, so I'd recommend that you watch through this 1-minute scrim to get ahold of it.

"Just-in-time" Learning

Another thing that separates this course from most other JavaScript courses is that it spreads the theoretical lessons evenly out across the entire course. Just in time when you need to learn it, and not a second before.

This means that you won't get long and boring lectures about abstract concepts before you start building projects.

Instead, we will dive head-first into building projects. And when we hit a road block, I will introduce you to the piece of theory we need in order to overcome it. This way, you will intuitively understand why you need to learn the theory.

However, don't be fooled to think that we will skip any theory. My course goes through the same important theory as any other good JavaScript course. But instead of squeezing it in all up-front, it is spread out evenly from start to end. Just it time when you need to learn it.

Learning by Doing

This tight integration between theory and practice means that most of your time will be spend building products. Here are the three projects you will build:

Screenshot-2021-05-14-at-10.08.57

Project 1: Passenger Counter

You'll start out by building a passenger counter app. This might seem like a bit of a contrived example, but counting passengers at the metro was my actually my full-time job for a time when I was 19 years old.

Here's a quick introduction to the app:

What's important here is that you are building an actual product from day one. You are combining JavaScript with HTML and CSS, so that you can learn JavaScript in the context of a real user interface in the browser.

This makes it a lot more fun than simply seeing your output in the console. While this adds a little bit of complexity, it it well worth it.

Project 2: Blackjack

Next, you will build your very first JavaScript game – Blackjack!

This is the first time you will code something that can also entertain you, which I think is important.

Blackjack is one of the most iconic Casino games ever, and this marks your first step into the world of game development.

Project 2: Chrome Extension

Finally, you will build a Chrome Extension that we are going deploy to your Chrome browser, so that you can use it out in the wild. This is exciting, as you'll really understand the super power you have gotten at this point.

The extension is called "Lead Tracker" and it is a tool for sales representatives. It allows them to browse the web and collect promising leads.

Check out the intro scrim for it to learn it a bit more:

Practice sections

After each of these project sections, I will stress-test your knowledge with dedicated challenge sections. This will also give you the necessary repetition you need in order to progress to the next project. I have tried to make all the challenges as real-world as possible so that they are fun to solve.

If you struggle to solve these challenges, then I would recommend that you revisit the scrims from the project sections as well. So these sections serve as gateways for progressing with the course.

You can enroll for free right now

I hope this gave you the background you needed in order to decide whether or not you'd like to try this course out. It's 100% free, and will be so forever. If you are interested, just click this link and you can get started immediately.

Finally, if you would like to help us spread the course, you can retweet my launch tweet. This will also give you the chance to win access to all Scrimba courses for a full year.

🔥 My free 7-hour beginner JavaScript course is finally OUT! It is IMHO the most interactive JS course ever recorded, with 140+ challenges. To celebrate, I'll give a 1-year @scrimba subscription (worth $150) to a random person who retweets this tweet 🎁 https://t.co/F5vmNwmCxQ — Per Harald Borgen (@perborgen) May 20, 2021

Co-founder of Scrimba.

If you read this far, thank the author to show them you care. Say Thanks

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21 Easy JavaScript Projects for Beginners (Code included!)

Looking to get some practice with JavaScript or to build your portfolio to impress hiring managers? You can level up your JavaScript skills with our instructor approved, curated project tutorials.

21 JavaScript Projects for Beginners (Code included!)

According to the 2023 Stack Overflow Developer Survey, JavaScript has spent eleven years in a row as the most commonly used programming language, with 66% of developers using it extensively. If you’re interested in becoming a web developer ( front end, back end, or full stack ), JavaScript is one of the best programming languages you can learn. One way to do that is to do some JavaScript projects for beginners.

Vanilla JavaScript, also known as “plain” JavaScript — meaning without any frameworks — is one of the foundations of coding and web development. Most web pages you see are built using a combination of HTML, CSS, vanilla JavaScript, and API calls.

Getting familiar with JavaScript basics means using those JavaScript skills to build JavaScript practice projects. Luckily, we know some fun JavaScript beginner projects you can do to hone your skills from the thousands of students we’ve trained in our front end development job training program, Break into Tech .

What we see with our successful students who have landed jobs at companies like GoDaddy, Toast, Asics Digital, 1Password, Figure and Apple is that they all have JavaScript practice projects, portfolios that show off their front end developer skills , and are very well versed in JavaScript. Doing JavaScript projects for beginners is a great way to get some practice and build your portfolio.

If you want to practice your front end developer skills, we’ve put together a list of 20+ JavaScript beginner projects you can start working on right now. When you find a JavaScript practice project that piques your interest, follow the project link. Each of these open source JavaScript projects for beginners (and above) have their source code listed on their homepage for you to use as a guide.

Lisa Savoie, one of Skillcrush’s JavaScript instructors, recommends reading the source code out loud to understand it better, looking for features to incorporate into other projects , or even retyping it to work on your muscle memory of how to write functions, variables, and loops.

She says, “You can Google methods you’re unfamiliar with to learn more about them or even break the code and fix it — It’s fun to break things😀.”

Table of Contents

  • JavaScript Projects Common Mistakes
  • Beginner JavaScript Projects
  • Mouseover Element
  • Magic 8 Ball
  • Build a To-Do List
  • Epic Mix Playlist
  • Speech Detection
  • Sticky Navigation
  • Geolocation

Intermediate JavaScript Projects

  • Election Map
  • Login Authentication
  • Guess the Word
  • Terminalizer
  • Tic Tac Toe Game
  • Hotel Booking App
  • Advanced JavaScript Project

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JavaScript Beginner Projects Common Mistakes

  • Read what the console is telling you, especially if you keep getting error messages
  • Are you working with the right type of variable? Is var, let, or const the right choice?
  • Is your logic sound? Are you properly using your array methods (when those are appropriate)?
  • Are you factoring in edge cases like empty inputs or negative integers?
  • Are you passing the right kind/type of argument to a function?

JavaScript Projects for Beginners

1. mouseover element.

Why do this project?

  • You’ll see how JavaScript functions work and practice your JavaScript logic
  • It’s a fun beginner JavaScript project to do to liven up your user experience
  • Learn more about using random, functions, and event listeners.

colorful dots on a blue background

Mouseover Element Source Code

Key concepts covered:

  • Functions and if-else statements
  • Event listeners

What to do:

  • Copy the source code from CodePen.
  • Implement the JavaScript code so that when you hover your mouse over a colored ball, it gets bigger.

Bonus Challenge:

To test your understanding of the concepts behind the mouseover element, your bonus challenge is this custom cursor project .

2. JavaScript Clock

  • You get hands-on with the kind of actual work you’ll be doing as a JavaScript developer
  • You’ll apply key JavaScript concepts and have an adorable project for your portfolio
  • Practice concepts like variables, conditional logic, and date API

lolcat meme on a Skillcrush pink background with clock elements

JavaScript Clock Source Code

  • Conditional logic
  • Program flow
  • DOM elements
  • Implement the JavaScript code so that every time you click the “Party Time!” button in the time range that you specify, you get a different LOLcat. You can set different times to see different images — there are four images total.

Bonus challenge: Now that you’ve mastered the Lolcat JavaScript clock, challenge yourself by building your own countdown timer.

3. Magic 8 Ball

  • It gives you a solid foundation for how to use Math.random to produce randomized results for JavaScript projects
  • You can use this project to impress your friends and make small life decisions
  • Learn more about how to use the random function, nested functions, and event listeners

Magic 8 Ball with hands on a light pink background

Magic 8 Ball Source Code

  • Math.random
  • Nested functions
  • Copy the source code from GitHub for HTML and CSS.
  • Implement the JavaScript code so that you can grab the 8 ball, ask it a question, shake it, and have the 8 ball respond with a somewhat enigmatic, somewhat applicable answer.

To test your understanding of the concepts behind the Magic 8 Ball, your bonus challenge is this dad joke generator.

4. To-Do List

  • You’ll beef up your skills at coding interactive lists, which lets users add, remove, and group items
  • You can use this beginner JavaScript project in your daily life and add it to your portfolio
  • Learn more about how to use arrays, nested functions, and local storage API

work to do list on a turquoise background

To-Do List Source Code

  • Local storage API
  • DOM manipulation
  • Implement the JavaScript code so that you can add new items and use the buttons to toggle completed items, edit items, or delete items.

To test your understanding of the concepts behind the To-Do list, your bonus challenge is this JavaScript grocery list.

5. Epic Mix Playlist

  • It helps you practice core JavaScript skills, such as forEach loops and event listeners, and work with functions and lists
  • You can use this project to show people looking at your portfolio your great taste in music
  • Learn more about how to classList, innerHTML, forEach, and template literals

the words "epic mix" with a "show me" button on a dark purple background

Epic Mix Playlist Source Code

  • Array loops (forEach)
  • document.createElement
  • Append to an array
  • Template literals
  • Copy the source code from CodeSandbox.
  • Implement the JavaScript code so that you can create an auto-generated list of your favorite songs and their indexes.

To test your understanding of the concepts behind the epic mix playlist, your bonus challenge is this favorite movie list.

6. Pet Rescue

  • It gives you a solid foundation for understanding factory function patterns and parameters
  • You can use this project to contribute to pet rescues or display inventory for products on a ecommerce site
  • Learn more about how to use factory functions, parameters, methods, and objects

"Sharon's Pet Rescue" text with light purple button and cat image on a white background

Pet Rescue Source Code

  • Factory functions
  • Object methods and properties
  • Implement the JavaScript code so that you can accept an animal’s name, species, and energy level as a parameter and indicate each animal’s status (whether they are sleeping or awake).

To test your understanding of the concepts behind Pet Rescue, your bonus challenge is this inventory system.

7. Drum Kit

  • You can see the interaction between seeing elements on the page and listening to sound and learning how to add and remove elements
  • You can use this project to practice your drum skills with your JavaScript skills
  • Learn more about how to use audio tags and document.querySelector

Grey keyboard letters on a white background

Drum Kit Source Code

  • Event Listener
  • document.querySelector
  • Clone the GitHub repo.
  • Implement the JavaScript code so that you can play the drums by pressing specific keys in the browser.

To test your understanding of the concepts behind the drum kit, your bonus challenge is this JavaScript piano player.

8. Speech Detection

  • It gives you a basis for understanding how speech detection works, which is good (and very cool!) to know
  • You’ll have a nifty notetaking method straight in your browser
  • Learn more about speech recognition, text content, and event listeners

white notebook paper in front of yellow background

Speech Detection Source Code

  • Window.SpeechRecognition
  • .textContent
  • Copy the source code from GitHub.
  • Implement the JavaScript code so that when you speak, whatever you say is transcribed on the lined paper on your screen.

To test your understanding of the concepts behind speech detection, your bonus challenge is this text to speech in different languages.

9. Sticky Navigation

  • It teaches you how to keep your elements in a fixed position on a page, which is a skill you might need in your front end developer role
  • You can use this to upgrade the design of your website or portfolio
  • Learn more about how to use query electors, event listeners, and offsetting

Blog header with water background on top of blog page

Sticky Navigation Source Code

  • .querySelector
  • Implement the JavaScript code so that when you scroll up or down the page, your navigation bar remains in a fixed and visible position.

To test your understanding of the concepts behind sticky navigation, your bonus challenge is to create a sliding navigation.

10. Geolocation

  • You can learn more about how to develop for mobile, how geolocation works, and how to test your code using simulators or a different device
  • You can use this project in your daily life (if you get lost easily)
  • Learn more about how to use query selectors, watch position, and coordinates

white compass on black background

Geolocation Source Code

  • .watchPosition
  • Install packages with npm and run your local server.
  • Implement the JavaScript code so that you see your location in real time. You will need iOS or an iOS simulator to test whether or not your code works.

To test your understanding of the concepts behind geolocation, your bonus challenge is this weather forecast tool.

11. Movie App

  • It gives you a solid foundation of how JavaScript works with HTML, CSS, and other tools
  • You can use this project to make your own custom movie app
  • Learn more about how to use JavaScript with jQuery, Bootstrap, and API calls

Window with the poster for The Fate of the Furious and movie times

Movie App Source Code

  • On click event
  • You’ll need to get yourself an API key!
  • Implement the JavaScript code so that you can make your own movie app that lets you view the most popular movies, sort them by genre, and search for other movies.

To test your understanding of the concepts behind the movie app, your bonus challenge is to build an ecommerce landing page.

12. Name Tags

  • As a beginner JavaScript project, it lets you practice using React to create a practical and useful tool
  • You can use this project to hone your React skills and key concepts
  • Learn more about how to handle user input, work with stateful components, and render array data models

12 red name tag stickers with names on them

Name Tag Generator Source Code

  • Handling user input
  • Stateful components
  • Render array data models
  • Implement the JavaScript code so that you can build a text box and button to let users input text and have it respond to the input by generating a new name tag!

To test your understanding of the concepts behind the name tag generator, your bonus challenge is this Pokemon React generator.

(Back to top.)

13. Tone.js

  • You’ll learn how to create interactive web browser music with advanced scheduling capabilities, synths and effects, and intuitive musical abstractions built on top of the Web Audio API
  • You can use this project to be your own personal DJ and music producer, for free!
  • Learn more about how to use event listeners, triggerAttack, triggerRelease, and different kinds of synths

grey bars on a white background

Tone.js Source Code

  • triggerAttack and triggerRelease
  • Copy the source code from the Tone.js GitHub.io page.
  • Implement the JavaScript code so that you can create interactive music in your own browser.

14. Election Map

  • It gives you a solid foundation of the difference between JavaScript, HTML, and CSS, especially what JavaScript does and how it does it
  • You can use this project in your daily life and add it to your portfolio
  • Learn more about how to use arrays and nested functions

US election map text with red and blue states and a counter at the bottom

Election Map Source Code

  • If-else and function practice
  • Parent-child relationships
  • getElementById
  • Copy the source code from JSBin.
  • Implement the JavaScript code so that you can add two candidates running for president and display the number of votes they received from each state, both in a table on the bottom right and when you mouse over a state.

To test your understanding of the concepts behind the election map, your bonus challenge is this interactive map.

15. Login Authentication

  • It introduces you to Angular JS and more advanced JavaScript concepts
  • You can see how login authentication works behind the scenes
  • Learn more about how to use function states, app controllers, and dependencies

AngularJS Login Sample text with green login button

Login Authenticator Source Code

  • State management
  • App controller
  • Dependencies
  • Implement the JavaScript code so that you can enter an email address and password, and have the system tell you if the email address is invalid when you press the “Submit” button.

To test your understanding of the concepts behind the Login Authenticator, your bonus challenge is this password generator.

16. Guess the Word

  • It gives you a solid foundation for methods, creating global variables, and working with event listeners
  • You can use this project as a party game or challenge with your friends and coworkers
  • Learn more about how to use methods, functions, and regular expressions

Guess the Word in a white box with light blue background and an orange Guess button

Guess the Word Source Code

  • Methods like match(), split(), trim(), and join()
  • Regular expressions
  • Implement the JavaScript code so that players start by entering a letter. If they guess correctly, the letter appears in the word. If they guess incorrectly, they learn how many guesses they have remaining. The player can also see which letters they’ve already guessed. The game lets the player know if they’ve already guessed a letter or entered a non-alphabetic character!

To test your understanding of the concepts behind the Guess the Word game, your bonus challenge is this Wordled game.

Warning: the difficulty level for this is advanced, so if you’re having trouble with it, it’s not you!

17. Terminalizer

  • It teaches you how to record your terminal screen and share your work with others
  • You can use this project to debug and work on coding projects with friends
  • Learn more about how to use recording files, frame delays, and set idle times

Terminalizer terminal screen with colorful text

Terminalizer Source Code

  • Recording files
  • Using frameDelay
  • Setting idle time
  • Implement the JavaScript code so that you can record your terminal and generate animated GIF images or share web player links.

To test your understanding of the concepts behind Terminalizer, your bonus challenge is to figure out how to play/pause GIFs.

18. Chat App

  • It gives you a solid foundation of how JavaScript and its front and back end libraries can be used to create applications
  • You can add this project to your portfolio to show your knowledge of programming concepts as a full stack developer
  • Learn more about how to use ReactJS, NodeJS, and sockets along with JavaScript

blue and white chat application windows with Real Time Chat Application text

Chat App Source Code and YouTube tutorial link

  • You won’t be able to clone and run the project straight from GitHub because there is no package.json file, but you can build this using the YouTube tutorial
  • Implement the JavaScript code so that you can build a real time chat application that lets you send and receive messages using web sockets

To test your understanding of the concepts behind the chat application, your bonus challenge is this React text editor.

19. Tic Tac Toe Game

  • This project will test your HTML semantics and your JavaScript logic skills
  • You can use this as a practice project and for something to do while your code compiles
  • Learn more about how to use arrays, grid methods, and event listeners

white tic tac toe game on black background with win loss tie record

Tic-Tac-Toe Source Code

  • Implement the JavaScript code so that the player can set difficulty level as easy or hard, choose whether to play as X or O, play a game with the computer, have it remember who won or drew, and play again.

To test your understanding of the concepts behind the Tic-Tac-Toe game, your bonus challenge is this hangman game.

20. Hotel Booking App

  • You’ll get to practice key concepts in JavaScript ES6 and React JSX
  • You can use this project to practice building sites with more functionality and use some of your creativity by making it look really spiffy
  • Learn more about how to manage data flow and manipulate the DOM

hotel booking app screen with room pictures and number of rooms remaining

Hotel Booking App Source Code

  • ES6 and React JSX practice
  • Managing data flow
  • Implement the JavaScript code so that you can create a sample booking on a hotel site, complete with filtered search results, room inventory display, and hotel ratings.

To test your understanding of the concepts behind the Hotel Booking App, your bonus challenge is this ticket booking app.

Advanced JavaScript Projects

21. maze game.

  • It gives you a solid idea of how JavaScript core skills and functions can be used to create interactive games
  • You can put this project in your portfolio and challenge friends
  • Learn more about how to use JavaScript math concepts, create elements, and use loops

Maze game with Pickle Rick and lettuce

Maze Game Source Code

  • Random and Floor
  • Element creation
  • Implement the JavaScript code so that you can get the pickle from one end of the maze to another using the arrow functions (or AWSD) on your keyboard, have it display the number of steps it took to complete the maze, and be able to set the difficulty level.

To test your understanding of the concepts behind the maze game, your bonus challenge is this Tetris game.

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Justina Hwang

Category: Blog , Coding Languages and Tools , Entry Level Tech Jobs , Front End Developer , Full Stack Developer , JavaScript , Learn to Code

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The Perfect Mix of

Nuts & Bolts Explanations

"How does it work?"

Real world & Fun Exercises

"When & Where would I use that?"

+ a healthy dash of tooling, best practices and hot take opinions

This course isn't exhaustive — it's energizing .

I'm not going to make you sit through me reading the docs of every single method available — that is boring and you can do that as you need it.

This course spends your time learning the things in JavaScript that I wish I knew both when I got started, but also before I got into frameworks and libraries.

As always, absolutely no use of foo , bar , baz or any other confusing programming conventions.

For a full list of all topics covered, see below at the video list!

Here are just a few things we build:

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Face Detection + Censorship

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Audio Visualization

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Image Gallery

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Etch-a-Sketch

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Async+Await Prompt UI

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Web Speech Game

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Dad Joke Fetcher

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Recipe Search

Who is this for?

Absolute beginners to "I can get some stuff done but don't feel totally comfortable".

This course is 100% beginner friendly. No JavaScript experience required. Basic HTML and CSS knowledge is assumed.

If you feel like you have some holes in your skill set, could use a refresher or just want to pick up some new tips+tricks, I'd recommend still taking this course.

The course is designed to be skip-able. Meaning that if you get the gist of the video, skip it! Onto the next one. We aren't building a large application in this one so there is no problem jumping around or ahead.

All the code for the course is open source and posted on Github

How is this different than your…

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JavaScript30.com course?

Beginner JavaScript teaches you everything about JavaScript. JavaScript30 is extra homework for this course.

JavaScript30 is almost entirely exercises — it assumes you already know JavaScript.

This course also uses exercises to cement concepts, but we dive much deeper into how these things work, gotchas, best practices, tooling and more.

If you have already done JavaScript30 - great! You have only scratched the surface and I still recommend taking Beginner JavaScript.

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ES6.io course?

My ES6.io course was created to update existing JavaScript developer's skillsets.

Beginner JavaScript is from scratch. Beginner JavaScript doesn't differentiate between ES6,ES7...ES100 and the JS that came before it — it's all just modern JavaScript and we use the best parts for the job.

There is overlap between the two courses — there is no need to take the ES6 course after this one. If you have already taken ES6, you'll still learn plenty in Beginner JavaScript!

Wes Bos

Meet Wes Bos

Wes Bos is a Full Stack Developer, Speaker and Teacher from Canada. He is a course creator, works as an independent web developer and is the co-host of Syntax - a popular web development podcast. Wes has taught over 500 students in 200+ classes and spoken at dozens of conferences around the world. Wes wrote his own bio in the third person for some reason.

Wes is the author of React For Beginners , Advanced React and GraphQL , ES6 for Everyone and Learn Node which together have sold over 55,000 copies. He is also the author of JavaScript30.com , CSSGrid.io , Flexbox.io and Command Line Power User , a set of free video series. 300,000 people have taken at least one of Wes' free video courses.

The Course Is…

Skip, hop and jump around. Take the whole course, or cherry pick the topics you need help with.

Incremental, Referenceable and Easy To Digest.

Well paced — not too fast, not too slow.

Videos && Modules

Each video breaks down a specific part of JavaScript and allows for quick referencing in the future. Some of them are just a few minutes while some of the exercises are much longer.

You can binge watch them all in a few days or do a few each day during your lunch or on your commute.

Closed Captioning and Transcripts are provided for every video

Module 1 The Basics

01 Welcome and Course Methodologies 03:41

02 Browser, Editor and Terminal Setup 10:00

03 Running and Loading JS 09:22

04 Variables and Statements 20:15

05 Code Quality Tooling with Prettier and ESLint 21:39

06 Types - Introduction 02:50

07 Types - Strings 14:16

08 Types - Numbers 11:26

09 Types - Objects 04:01

10 Types - null and undefined 04:58

11 Types - Booleans and Equality 05:47

Module 2 Functions

12 Functions - Built in 14:32

13 Functions - Custom 10:43

14 Functions - Parameters and Arguments 22:35

15 Different Ways to Declare Functions 37:17

16 Debugging Tools 27:06

Module 3 The Tricky Bits

17 Scope 23:02

18 Hoisting 05:29

19 Closures 12:38

Module 4 The DOM — Working with HTML and CSS

20 The DOM - Introduction to the document 05:34

21 The DOM - Selecting Elements 11:30

22 The DOM - Element Properties and Methods 14:29

23 The DOM - Working with Classes 08:48

24 The DOM - Build in and Custom Data Attributes 11:41

25 The DOM - Creating HTML 19:53

26 The DOM - HTML from Strings and XSS 19:10

27 The DOM - Traversing and Removing Nodes 11:11

28 The DOM - CARDIO 22:19

Module 5 Events

29 Events - Event Listener 23:17

30 Events - targets, bubbling, propagation and capture 26:01

31 Events - Prevent Default and Form Events 15:05

32 Events - Accesibility Gotchas and Keyboard Codes 09:20

Module 6 Serious Practice Exercises

33 Etch-a-Sketch 45:20

34 Click Outside Modal 23:57

35 Scroll Events and Intersection Observer 19:16

36 Tabs 21:54

Module 7 Logic and Flow Control

37 BEDMAS 04:23

38 Flow Control - If Statements, Function Returns, Truthy, Falsy 29:05

39 Coercion, Ternaries and Conditional Abuse 16:00

40 Case Switch and Animating a Turtle with CSS Variables 18:04

41 Intervals and Timers 13:10

Module 8 Data Types

42 Objects 23:37

43 Object Reference vs Values 18:02

44 Maps 15:34

45 Arrays 31:56

46 Array Cardio - Static Methods 15:50

47 Array Cardio - Instance Methods 15:34

48 Array Cardio - Callback Methods and Function Generation 33:49

Module 9 Gettin' Loopy

49 Looping and Iterating - Array .forEach 11:53

50 Looping and Iterating - Mapping 21:33

51 Looping and Iterating - Filter, Find and Higher Order Functions 10:44

52 Looping and Iterating - Reduce 16:40

53 Looping and Iterating - Reduce Exercise 16:14

54 Looping and Iterating - for, for in, for of and while Loops 19:35

Module 10 Harder Practice Exercises

55 Face Detection and Censorship 54:31

56 Sarcastic Text Generator 22:53

57 Shopping Form with Custom Events, Delegation and localstorage 58:50

58 Building a Gallery Exercise 35:25

59 Building a Slider 34:22

Module 11 Prototypes, `this`, `new` and Inheritance

60 The New Keyword 11:44

61 The this Keyword 10:35

62 Prototype Refactor of the Gallery Exercise 17:44

63 Prototypes and Prototypal Inheritance 19:30

64 Prototype Refactor of the Slider Exercise 12:23

65 bind, call and apply 19:45

Module 12 Advanced Flow Control

66 The Event Loop and Callback Hell 17:44

67 Promises 21:24

68 Promises - Error Handling 07:31

69 Refactoring Callback Hell to Promise Land 08:59

70 Async Await 14:23

71 Async Await Error Handling 14:02

72 Async Await Prompt UI 43:44

73 Async Typer UI - two ways 18:18

Module 13 Ajax and Fetching Data

74 Ajax and APIs 18:13

75 CORS and Recipes 34:47

76 Dad Jokes 23:11

77 Currency Converter 28:30

Module 14 ES Modules and Structuring Larger Apps

78 Modules 32:57

79 Currency Modules Refactor 15:14

80 Dad Jokes Modules Refactor 13:59

81 Bundling and Building with Parcel 15:06

82 using open source npm packages 34:22

83 Security 16:32

Module 15 Final Round of Exercises

84 Web Speech Colours Game 29:13

85 Audio Visualization 44:30

Course Packages

Starter course.

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  • Access to the first 6 Modules / 36 HD Video Tutorials
  • Stream course from any device
  • Source Code — Completed Examples and Exercises
  • Unlimited Updates + Never Expires

Slack

Use the code RUSSIALOVE for an extra 30% off the below price if you need it.

Join 22,201 Others!

Master Package

homework for js

  • Access to all 15 Modules / 88 HD Videos — see above for a full listing of topics
  • Stream and Download DRM-free files from any device
  • Includes Promises, Async + Await, Data Types, Ajax, Modules and much more

22,201 already sold!

Team License Packages

With a team license you can buy a number of spots to allocate to employees. The spots do not expire and you can fill the spots via the dashboard whenever you like.

Perfect for on-boarding new hires, interns and contractors to your tech stack.

The team license includes everything in the Master Package above. Spots cannot be re-assigned once used.

For larger groups or for on-site training contact me for more info!

All prices in USD

I bet you have so many questions!

Do these videos expire? Is this a monthly cost?

Nope and nope. Pay once, have them forever. Updates are also free.

What frameworks do you use? React? Vue?

The whole idea of this course is that it will set you up for success no matter the framework you use.

No frameworks are used in this course — it's all "Just JavaScript" using the core language and "Vanilla JS" DOM APIs.

What about tools? Webpack? Babel? Parcel?

Almost everything in this course is done via a script tag — even the modules section!

The modules section of the course first uses straight up ES Modules in HTML. Then we move on to using Parcel.js to bundle and transpile our code. This uses Babel behind the scenes.

Is this updated for ES 2047?!

Yes. As new stuff comes out that I find will be helpful to your journey as a dev, I'll add or amend new videos :)

Do you provide a certificate of completion?

Sure do! In your course dashboard you can download an official certificate of completion that can be used to be reimbursed by your employer or land that dream job you are applying for.

Can I put the code on GitHub? Can I put this app in my portfolio? Can I blog about this?

Absolutely - I just ask that you don't create your own course teaching with this app. Otherwise, go nuts! You can credit my course if you like, but it's not required as you might be using this app to get a job :)

What other courses do you have?

I've got a bunch of free and premium web development courses — check out the whole listing over at wesbos.com/courses .

I lost, deleted or never got my welcome email! What do I do?

Log into your account , or create an account with the same email you used to buy the series.

What format are the videos? How do I watch them?

Once you buy a package, you will be mailed access to your account dashboard where you can stream all the videos. Buyers of the Master Package will also be able to download them for off-line viewing. All the videos were professionally recorded at 4k with top quality audio — no pops, echoes, chair squeaks, breathing or gross mouth sounds here! The downloaded versions are in 1080p HD.

What if I'm not thrilled?

I want to make sure you get real value out of this so I only want your money if you are happy with the product! If you aren't satisfied, please send an email to [email protected] with a copy of your welcome email and I will refund you.

Do you offer a student discount?

Absolutely! Fill out this form with some proof that you are a student and I'll send you a discount code. This applies to anyone in any type of schooling, including evening classes and coding bootcamps!

If you have received a student discount for a previous product, it's the same code 😉.

What theme do you use? What is that font? What terminal do you use? What kind of bread do you buy?

I've detailed my entire setup over here , feel free to tweet me with any more questions you have about setting things up.

I have another question!

Sure - email me at [email protected] or give me a call 416-833-3641 !

Always Bet on JavaScript

© Wes Bos ∞

Hey, please don't Copy Me 😘

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React For Beginners

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Intro to JavaScript: Arrays, Objects, Functions

Build an interactive web page.

This course gives an overview of JavaScript and programming generally. It does not cover libraries like jQuery or the DOM.

Class Schedule

The course is divided into 3 lessons in 2 days (12 hours of in-class instruction).

Lesson 1: Variables & Functions

  • Lesson 2: Control Flow & Arrays

Lesson 3: Objects

Prerequisites.

The students should have some familiarity with HTML/CSS (classes/ids). They do not need prior programming experience.

Each lesson includes:

  • Slides : An HTML5-based slideset ( not a PowerPoint) which actually embeds the actual HTML tags being described in order to better demonstrate them.
  • In-class example : An example of what the teacher should build up during the course of the lesson, switching between talking over the slides and demonstrating the concepts in the example page.
  • Exercise(s) : These can be started in class and then continued outside of it, and the teacher can decide when to reveal the solution for the exercises. For the most part, the solution to an exercise serves as the starting point for the next exercise.
  • Take-home assignment and solution : A take-home assignment that incorporates many of the concepts from the class, along with a solution. We recommend an additional study group for the students to review their solutions.
  • Additional Reading : Links that teachers can recommend students read after a lesson.
  • Related Resources : Slides or tutorials that were useful in the creation of the lesson content. Teachers can visit these to get an idea of how other people present the content.
  • Room for Improvement : A list of ways that the particular lesson might be improved.
  • Make testing your code easier by loading javascript to an HTML page. Click here for instructions.

For this course, I recommend having the students use repl.it for the first two lessons, for easy JS debugging. That's also useful for in-class examples.

Related Resources

The content for the slides was based on consultation with a number of fantastic online resources, including the Eloquent JavaScript and MDN Guide on JavaScript . Those are recommended reading for teachers of this course. It was also inspired by these JS slidesets: Estelle's Intro to JS , Cathy's JS 101 , WASP JS Intro , and GDI JS Materials .

This course was given by Pamela Fox in May, 2012 as part of Girl Develop It in San Francisco, California. More recently, this has been taught and updated by Brenda Jin, Bianca Gandolfo, and Claire Bendersky.

If you are using this material and have questions/comments, feel free to leave them here or on the individual lesson pages.

programming languages, JS history, variables, functions

  • Slides: Intro to Programming
  • Slides: Intro to JS, Variables, and Functions
  • Exercise: Variables
  • Exercise: Functions
  • Homework: The Calculator
  • Homework: Strings

Additional Reading:

  • Language Levels
  • The History of JavaScript
  • JavaScript Data Types & Variables
  • JavaScript Functions

Lesson 2: Control Flows & Arrays

if, else, for, while

  • Slides: Control Flow & Arrays
  • Exercise: if/else
  • Exercise: for loops
  • Exercise: arrays
  • Homework: The Word Guesser
  • Eloquent JavaScript: Values, Variables, & Control Flow
  • MDN: Expressions and Operators

Objects, JS built-in objects

  • Slides: Objects
  • Exercise: Objects
  • Exercise: Objects as Arguments
  • Homework: Cash Register
  • Homework: The Credit Card Validator
  • Homework Solution for The Credit Card Validator
  • MDN: Objects and Properties (only that section)
  • Skip to main content
  • Skip to search
  • Skip to select language
  • Sign up for free
  • English (US)

Basic math in JavaScript — numbers and operators

  • Overview: First steps

At this point in the course, we discuss math in JavaScript — how we can use operators and other features to successfully manipulate numbers to do our bidding.

Everybody loves math

Okay, maybe not. Some of us like math, some of us have hated math ever since we had to learn multiplication tables and long division in school, and some of us sit somewhere in between the two. But none of us can deny that math is a fundamental part of life that we can't get very far without. This is especially true when we are learning to program JavaScript (or any other language for that matter) — so much of what we do relies on processing numerical data, calculating new values, and so on, that you won't be surprised to learn that JavaScript has a full-featured set of math functions available.

This article discusses only the basic parts that you need to know now.

Types of numbers

In programming, even the humble decimal number system that we all know so well is more complicated than you might think. We use different terms to describe different types of decimal numbers, for example:

  • Integers are floating-point numbers without a fraction. They can either be positive or negative, e.g. 10, 400, or -5.
  • Floating point numbers (floats) have decimal points and decimal places, for example 12.5, and 56.7786543.
  • Doubles are a specific type of floating point number that have greater precision than standard floating point numbers (meaning that they are accurate to a greater number of decimal places).

We even have different types of number systems! Decimal is base 10 (meaning it uses 0–9 in each column), but we also have things like:

  • Binary — The lowest level language of computers; 0s and 1s.
  • Octal — Base 8, uses 0–7 in each column.
  • Hexadecimal — Base 16, uses 0–9 and then a–f in each column. You may have encountered these numbers before when setting colors in CSS .

Before you start to get worried about your brain melting, stop right there! For a start, we are just going to stick to decimal numbers throughout this course; you'll rarely come across a need to start thinking about other types, if ever.

The second bit of good news is that unlike some other programming languages, JavaScript only has one data type for numbers, both integers and decimals — you guessed it, Number . This means that whatever type of numbers you are dealing with in JavaScript, you handle them in exactly the same way.

Note: Actually, JavaScript has a second number type, BigInt , used for very, very large integers. But for the purposes of this course, we'll just worry about Number values.

It's all numbers to me

Let's quickly play with some numbers to reacquaint ourselves with the basic syntax we need. Enter the commands listed below into your developer tools JavaScript console .

  • First of all, let's declare a couple of variables and initialize them with an integer and a float, respectively, then type the variable names back in to check that everything is in order: js const myInt = 5 ; const myFloat = 6.667 ; myInt ; myFloat ;
  • Number values are typed in without quote marks — try declaring and initializing a couple more variables containing numbers before you move on.
  • Now let's check that both our original variables are of the same datatype. There is an operator called typeof in JavaScript that does this. Enter the below two lines as shown: js typeof myInt ; typeof myFloat ; You should get "number" returned in both cases — this makes things a lot easier for us than if different numbers had different data types, and we had to deal with them in different ways. Phew!

Useful Number methods

The Number object, an instance of which represents all standard numbers you'll use in your JavaScript, has a number of useful methods available on it for you to manipulate numbers. We don't cover these in detail in this article because we wanted to keep it as a simple introduction and only cover the real basic essentials for now; however, once you've read through this module a couple of times it is worth going to the object reference pages and learning more about what's available.

For example, to round your number to a fixed number of decimal places, use the toFixed() method. Type the following lines into your browser's console :

Converting to number data types

Sometimes you might end up with a number that is stored as a string type, which makes it difficult to perform calculations with it. This most commonly happens when data is entered into a form input, and the input type is text . There is a way to solve this problem — passing the string value into the Number() constructor to return a number version of the same value.

For example, try typing these lines into your console:

You end up with the result 743, not 77, because myNumber is actually defined as a string. You can test this by typing in the following:

To fix the calculation, you can do this:

The result is then 77, as initially expected.

Arithmetic operators

Arithmetic operators are used for performing mathematical calculations in JavaScript:

Note: You'll sometimes see numbers involved in arithmetic referred to as operands .

Note: You may sometimes see exponents expressed using the older Math.pow() method, which works in a very similar way. For example, in Math.pow(7, 3) , 7 is the base and 3 is the exponent, so the result of the expression is 343 . Math.pow(7, 3) is equivalent to 7**3 .

We probably don't need to teach you how to do basic math, but we would like to test your understanding of the syntax involved. Try entering the examples below into your developer tools JavaScript console to familiarize yourself with the syntax.

  • First try entering some simple examples of your own, such as js 10 + 7 ; 9 * 8 ; 60 % 3 ;
  • You can also try declaring and initializing some numbers inside variables, and try using those in the sums — the variables will behave exactly like the values they hold for the purposes of the sum. For example: js const num1 = 10 ; const num2 = 50 ; 9 * num1 ; num1 ** 3 ; num2 / num1 ;
  • Last for this section, try entering some more complex expressions, such as: js 5 + 10 * 3 ; ( num2 % 9 ) * num1 ; num2 + num1 / 8 + 2 ;

Parts of this last set of calculations might not give you quite the result you were expecting; the section below might well give the answer as to why.

Operator precedence

Let's look at the last example from above, assuming that num2 holds the value 50 and num1 holds the value 10 (as originally stated above):

As a human being, you may read this as "50 plus 10 equals 60" , then "8 plus 2 equals 10" , and finally "60 divided by 10 equals 6" .

But the browser does "10 divided by 8 equals 1.25" , then "50 plus 1.25 plus 2 equals 53.25" .

This is because of operator precedence — some operators are applied before others when calculating the result of a calculation (referred to as an expression , in programming). Operator precedence in JavaScript is the same as is taught in math classes in school — multiply and divide are always done first, then add and subtract (the calculation is always evaluated from left to right).

If you want to override operator precedence, you can put parentheses around the parts that you want to be explicitly dealt with first. So to get a result of 6, we could do this:

Try it and see.

Note: A full list of all JavaScript operators and their precedence can be found in Operator precedence .

Increment and decrement operators

Sometimes you'll want to repeatedly add or subtract one to or from a numeric variable value. This can be conveniently done using the increment ( ++ ) and decrement ( -- ) operators. We used ++ in our "Guess the number" game back in our first splash into JavaScript article, when we added 1 to our guessCount variable to keep track of how many guesses the user has left after each turn.

Let's try playing with these in your console. For a start, note that you can't apply these directly to a number, which might seem strange, but we are assigning a variable a new updated value, not operating on the value itself. The following will return an error:

So, you can only increment an existing variable. Try this:

Okay, strangeness number 2! When you do this, you'll see a value of 4 returned — this is because the browser returns the current value, then increments the variable. You can see that it's been incremented if you return the variable value again:

The same is true of -- : try the following

Note: You can make the browser do it the other way round — increment/decrement the variable then return the value — by putting the operator at the start of the variable instead of the end. Try the above examples again, but this time use ++num1 and --num2 .

Assignment operators

Assignment operators are operators that assign a value to a variable. We have already used the most basic one, = , loads of times — it assigns the variable on the left the value stated on the right:

But there are some more complex types, which provide useful shortcuts to keep your code neater and more efficient. The most common are listed below:

Try typing some of the above examples into your console, to get an idea of how they work. In each case, see if you can guess what the value is before you type in the second line.

Note that you can quite happily use other variables on the right-hand side of each expression, for example:

Note: There are lots of other assignment operators available , but these are the basic ones you should learn now.

Active learning: sizing a canvas box

In this exercise, you will manipulate some numbers and operators to change the size of a box. The box is drawn using a browser API called the Canvas API . There is no need to worry about how this works — just concentrate on the math for now. The width and height of the box (in pixels) are defined by the variables x and y , which are initially both given a value of 50.

Open in new window

In the editable code box above, there are two lines marked with a comment that we'd like you to update to make the box grow/shrink to certain sizes, using certain operators and/or values in each case. Let's try the following:

  • Change the line that calculates x so the box is still 50px wide, but the 50 is calculated using the numbers 43 and 7 and an arithmetic operator.
  • Change the line that calculates y so the box is 75px high, but the 75 is calculated using the numbers 25 and 3 and an arithmetic operator.
  • Change the line that calculates x so the box is 250px wide, but the 250 is calculated using two numbers and the remainder (modulo) operator.
  • Change the line that calculates y so the box is 150px high, but the 150 is calculated using three numbers and the subtraction and division operators.
  • Change the line that calculates x so the box is 200px wide, but the 200 is calculated using the number 4 and an assignment operator.
  • Change the line that calculates y so the box is 200px high, but the 200 is calculated using the numbers 50 and 3, the multiplication operator, and the addition assignment operator.

Don't worry if you totally mess the code up. You can always press the Reset button to get things working again. After you've answered all the above questions correctly, feel free to play with the code some more or create your own challenges.

Comparison operators

Sometimes we will want to run true/false tests, then act accordingly depending on the result of that test — to do this we use comparison operators .

Note: You may see some people using == and != in their tests for equality and non-equality. These are valid operators in JavaScript, but they differ from === / !== . The former versions test whether the values are the same but not whether the values' datatypes are the same. The latter, strict versions test the equality of both the values and their datatypes. The strict versions tend to result in fewer errors, so we recommend you use them.

If you try entering some of these values in a console, you'll see that they all return true / false values — those booleans we mentioned in the last article. These are very useful, as they allow us to make decisions in our code, and they are used every time we want to make a choice of some kind. For example, booleans can be used to:

  • Display the correct text label on a button depending on whether a feature is turned on or off
  • Display a game over message if a game is over or a victory message if the game has been won
  • Display the correct seasonal greeting depending on what holiday season it is
  • Zoom a map in or out depending on what zoom level is selected

We'll look at how to code such logic when we look at conditional statements in a future article. For now, let's look at a quick example:

You can see the equality operator being used just inside the updateBtn() function. In this case, we are not testing if two mathematical expressions have the same value — we are testing whether the text content of a button contains a certain string — but it is still the same principle at work. If the button is currently saying "Start machine" when it is pressed, we change its label to "Stop machine", and update the label as appropriate. If the button is currently saying "Stop machine" when it is pressed, we swap the display back again.

Note: Such a control that swaps between two states is generally referred to as a toggle . It toggles between one state and another — light on, light off, etc.

Test your skills!

You've reached the end of this article, but can you remember the most important information? You can find some further tests to verify that you've retained this information before you move on — see Test your skills: Math .

In this article, we have covered the fundamental information you need to know about numbers in JavaScript, for now. You'll see numbers used again and again, all the way through your JavaScript learning, so it's a good idea to get this out of the way now. If you are one of those people that doesn't enjoy math, you can take comfort in the fact that this chapter was pretty short.

In the next article, we'll explore text and how JavaScript allows us to manipulate it.

Note: If you do enjoy math and want to read more about how it is implemented in JavaScript, you can find a lot more detail in MDN's main JavaScript section. Great places to start are our Numbers and dates and Expressions and operators articles.

Homework for beginners JS

I’m at the beginning in this field, I am signed up in an introductory course and the current theme is to introduce a word in a string.I got stuck and I really don’t understand what to do. The code must be contained in that form. I’ll show you where I lose myself.

:slight_smile:

Firstly, welcome to the forums.

While we are primarily here to help people with their Free Code Camp progress, we are open to people on other paths, too. Some of what you are asking is pretty trivial in the Free Code Camp context, so you might find that if you’re not getting the instruction and material you need in your current studies, the FCC curriculum will really help you get started. At a modest guess I’d say investing a 4-5 hours working through the curriculum here will really pay off. You can find the curriculum at https://www.freecodecamp.org/learn .

With your current questions, we don’t have enough context to know what you already know or don’t know , so it is impossible to guide you without just telling you the answer ( which we won’t do ).

It is pretty typical on here for people to share a codepen / repl.it / jsfiddle example of what they have tried so that anyone helping has more of an idea of what help is actually helpful.

Please provide some example of what you’ve tried and I’m sure you’ll get more help.

Hy! Thanks for the answer I have to introduce a word “strawberries” in a string “Ana has apples and pears” at a certain position, more precisely at position 6.

In the last message I started writing the code but I blocked my self after I write the function I have already started to learn freecodecamp, only that I have reached only 40% and I have not yet gathered the knowledge necessary to solve this banality.

What have you tried so far? What part are you stuck on? What specific questions do you have?

I tried to create a new variable to include the requested string which when called in console.log to show the new string.

another thing I don’t realize is how to enter the new word if I do not divide the string into two variables and then add them with the new word

Have you tried evaluating that code and seeing what you get back? I recommend using repl.it for quick tests.

the question is that I have to think of it in such a way that writing code and using a “for” and an “if” to have the result Ana has “strawberry” apple pears

Honestly, I don’t get the requirements – neither a for-loop nor a condition makes any sense for this problem – and the answer isn’t even understandable English. Are you sure you got the requirements correct?

Edit: Okay, I sort of get how you could do it in a loop by going over every character in the string, but that’s ridiculous . You wouldn’t even do that in C, for dog’s sake. That’s something you’d only do in assembly or forth and probably not even forth.

I’ll be blunt: I think your course is terrible and you should find another.

hello! sorry, I didn’t do it intentionally only that the first relay was not loaded and I thought it was an error or something like that, sorry

Hello You may be right, but I have to do it anyway, as I explained, above. I’m a beginner, but to get stuck in the 2nd lesson is more ridiculous than the lesson itself If you can explain it to me, it would be ok if not it is not a problem. thanks

do you have any obligations to do that course in particular?

if you don’t have I highly suggest you do the freecodecamp course, it doesn’t have weird things like that.

So, the starting code for your challenge is the function with the loop? Please confirm or deny this.

What have you learned so far? just loops and string concatenation? because if you don’t know anything else it seems a bit… weird to do like this. Not impossible, but weird.

I am not going to give you the solution, but here some hints:

while you loop over the string, you check when you have reached the correct index, and do something

strings are immutable, you can’t change directly the given string, you need to create a new string - also you can’t change the string you are looping over because it will throw up the loop chasing the length of the string so don’t use the same variable for the new string

Glad to help, just do like this.No need looping.

Hello ! If you do not remember the Homework, it was to insert the word strawberries in that string "ana has apples " at the position 6. Can I have others hints here, please? Why newstring does not appear in the console?

what do you think this line is doing?

what do you think this is doing?

it’s length

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About Javascript

Javascript(JS) is a object-oriented programming language which adhere to ECMA Script Standards. Javascript is required to design the behaviour of the web pages.

Key Features

  • Open-source
  • Just-in-time compiled language
  • Embedded along with HTML and makes web pages alive
  • Originally named as LiveScript.
  • Executable in both browser and server which has Javascript engines like V8(chrome), SpiderMonkey(Firefox) etc.

Syntax help

Stdin example, variable declaration, backtick strings, interpolation, multi line strings.

An array is a collection of items or values.

Arrow functions

Arrow Functions helps developers to write code in concise way, it’s introduced in ES6. Arrow functions can be written in multiple ways. Below are couple of ways to use arrow function but it can be written in many other ways as well.

De-structuring

Rest(...) operator, spread(...) operator.

IF is used to execute a block of code based on a condition.

2. If-Else:

Else part is used to execute the block of code when the condition fails.

Switch is used to replace nested If-Else statements.

For loop is used to iterate a set of statements based on a condition.

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

6. Do-While

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

ES6 introduced classes along with OOPS concepts in JS. Class is similar to a function which you can think like kind of template which will get called when ever you initialize class.

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JavaScript Homework Help | JavaScript Assignment Help

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Why JavaScript?

The first-ever JavaScript was created by Brendan Eich at Netscape and has since been updated to conform to ECMA-262 Edition 5 and later versions.

Its popularity stems from the fact that JavaScript allows web developers to infuse complex features into web pages.

Without JavaScript, web pages won’t really do much other than displaying static information (a.k.a. BORING!). If web pages were to be a cake, Javascript is the exciting cherry on top. Let’s break it down for you later by layer for better understanding.

  • HTML (The cake) -Think of hypertext markup language as a cake out of the oven. It is used to build the structure and framework of the web page. It is used for embedding images, video clips, for defining paragraphs, headings, and data tables in the web page. if you need HTML homework help .
  • CSS (The icing) – Cascading Style Sheets is a style sheet language used to style and present the website in an appealing way. It is used for adding color, choosing fonts and also helps developers adapt the web page for different device dimensions.
  • JavaScript (The cherry and sprinkles) – JavaScript makes a page exciting. It is used for creating dynamic websites. It also allows you to control multimedia content, animate images, and update content timely.

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JavaScript is touted as the standard scripting language of the web. And, it is allegedly being used by over 95% of websites globally.

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Some of the most common uses of the lightweight interpreted programming language is for building –

  • Web development
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Some of the most popular websites are built with JavaScript.

Benefits of javascript.

  • It is believed to be the fastest performing dynamic language present in the market today. JavaScript can be run on the client-side browser which makes it super-fast.
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  • JS complements a variety of other languages which can be used to build a variety of applications.
  • Moreover, JavaScript is compatible with all modern browsers and gives consistent results.
  • JavaScript always gets executed on the client environment regardless of where you host it. As a result, a lot of bandwidth is saved and execution becomes fast-paced.
  • Finally, JavaScript is one of the simplest languages to learn.

JavaScript best practices to improve your skills dramatically –Get Javascript homework help now !

Refrain from using global variables including all data types, functions, and objects. Instead, use local variables.

  • First, Make sure to declare local variables every time with “var” or “let” keywords.
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  • Create cleaner codes and reduce the possibility of unwanted re-declarations by putting all the declarations at the top of each script or function
  • Avoid undefined values by initializing variables when you declare them.
  • Use the concatenation operator + followed by an empty set of quotation marks “” to convert a number to string quickly.
  • Declaring numbers, sting, and Boolean as objects instead of primitive values slows down execution speed.
  • Use JavaScript libraries like jQuery, Dojo Toolkit, and Mootools to save a lot of time while coding.
  • Make sure to end your “switch” statements with a “default”.
  • Finally, Avoid using Eval ().

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MongoDB with Node.js

MongoDB and Node.js work seamlessly together in modern tech stacks. Learn how to set up Node.js and MongoDB as well as how to query data stored in a MongoDB database from a Node.js script.

MongoDB is a flexible, general-purpose document database that is ideally suited for modern applications.. Node.js is a JavaScript runtime that commonly powers web servers. Developers can use these two pieces of technology, along with MongoDB Atlas , a fully managed, multi-cloud database service, to rapidly create modern applications.

In this article, you'll learn the following:

  • The Basics of MongoDB and Node.js

How to Set Up Node.js and MongoDB

  • How to use CRUD operations

How to Use MongoDB with Node.js

Using mongodb with node.js.

MongoDB and Node.js have a long history of working well together and are paired in many popular tech stacks, including the MEAN stack (MongoDB, Express.js, AngularJS, and Node.js) and and, more recently, the MERN stack (MongoDB, Express.js, React.js, and Node.js).

The MongoDB Node.js driver makes working with MongoDB from inside a Node.js script simple and intuitive for developers—saving time and increasing productivity.

In this section, we'll walk through how to set up a Node.js script that connects to a MongoDB database.

Prerequisites

Before you begin, you'll need to ensure you've completed a few prerequisite steps.

  • If you haven't already, install Node.js and create a new Node.js project .
  • Create a MongoDB database. The easiest way to get started with MongoDB is to create a free cluster in MongoDB Atlas , MongoDB's fully-managed, multi-cloud document database service.
  • Then load the sample dataset .
  • Add the MongoDB Node.js Driver to your Node project dependencies using the following command:

Now that you have completed the prerequisites, you're ready to begin coding!

Get Connected

You can use the MongoClient to connect to a MongoDB database. Import the MongoClient in a new Node.js script:

Then create an instance of MongoClient by passing your connection URI to it. For more information on how to find your connection URI and ensure your Atlas database is ready for connection, see the official MongoDB documentation on connecting to a cluster .

Now you're ready to get connected:

These are the basics of getting connected. For more detailed information on how to get connected to a MongoDB database from a Node.js script, see Connect to a MongoDB Database Using Node.js .

What You Need to Know

To begin working with MongoDB from a Node.js script, you should understand how MongoDB stores data as well as the basic methods you can use to query your data. We'll cover both topics below.

How MongoDB Stores Data

MongoDB stores data as BSON documents . BSON is a binary representation of JSON (JavaScript Object Notation).

Documents are similar in structure to JavaScript objects and store information in field-value pairs. Every document is required to have an _id field . The value stored in _id must be unique for every document in the collection.

Documents typically contain information about one object and any information that will be queried with that object. Related documents are grouped together in collections. Related collections are stored together in databases.

CRUD Operations

The MongoDB Node.js driver provides a variety of methods to help you query your data. These methods are known as CRUD (create, read, update, and delete) operations.

Use insertOne() to create a new document. insertOne() has only one required parameter: the document to insert. If the document does not include a field named _id, the MongoDB Node.js driver will add one automatically.

To create multiple documents, use insertMany() . The only argument you are required to pass to insertMany() is an array of documents to insert.

Both insertOne() and insertMany() allow you to pass optional settings. One optional setting to note for insertMany() is the boolean ordered. If an insert fails when ordered is to true, the remaining inserts will not be executed. If an insert fails when ordered is to false, the remaining inserts will be executed. See the official documentation for more information.

To retrieve a single document from your database, use findOne() . findOne() requires that you pass a query object. The query can contain zero to many properties.

To retrieve multiple documents from your database, use find() . Like findOne(), find() requires you to pass a query object that contains zero to many properties. find() returns a cursor that you can use to iterate over the results.

Both findOne() and find() allow you to pass optional settings when you call them. One handy option is projection, which allows you to explicitly exclude or include the fields that are returned in the query.

Use updateOne() when you want to update a single document. updateOne() has two required parameters: a filter object that indicates which document should be updated and an update object that indicates the update operations that should be applied to the document.

To update multiple documents, you can use updateMany() . updateMany() has the same required parameters as updateOne(): a filter object and an update object.

Both updateOne() and updateMany() allow you to pass optional settings to them when you call them. upsert is one of the options you can pass. When upsert is set to true, a new document will be created if no document matches the query. upsert can be really helpful as it allows you to combine multiple operations into one: checking to see if a document exists and then updating the document if it exists or creating a new document if it does not.

To delete a single document, use deleteOne() . A filter object that indicates the document to be deleted is the only required parameter.

Use deleteMany() when you want to delete multiple documents. Like deleteOne(), the only required parameter is the filter object.

Both deleteOne() and deleteMany() allow you to pass optional settings as well. See the official documentation for more information.

Now you know the basics of querying data stored in a MongoDB database from a Node.js script. For more detailed information on how to execute the CRUD operations in a Node.js script, see MongoDB and Node.js Tutorial - CRUD Operations .

The MongoDB Node.js driver makes using MongoDB with Node.js a seamless experience. The driver automatically maps JavaScript objects to BSON documents, meaning that developers can easily work with their data.

Want to learn more about using MongoDB with Node.js?

Check out the following resources:

  • Official MongoDB Documentation on the MongoDB Node.js Driver
  • Official MongoDB Node.js Driver FAQ
  • MongoDB University Free Course: M220JS: MongoDB for JavaScript Developers
  • Blog Series: MongoDB and Node.js Quick Start
  • Video Series: MongoDB and Node.js Quick Start

If you have any questions about MongoDB, join the MongoDB Community .

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JS Tutorial

Js versions, js functions, js html dom, js browser bom, js web apis, js vs jquery, js graphics, js examples, js references, javascript arithmetic, javascript arithmetic operators.

Arithmetic operators perform arithmetic on numbers (literals or variables).

Arithmetic Operations

A typical arithmetic operation operates on two numbers.

The two numbers can be literals:

or variables:

or expressions:

Operators and Operands

The numbers (in an arithmetic operation) are called operands .

The operation (to be performed between the two operands) is defined by an operator .

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The addition operator ( + ) adds numbers:

Subtracting

The subtraction operator ( - ) subtracts numbers.

Multiplying

The multiplication operator ( * ) multiplies numbers.

The division operator ( / ) divides numbers.

The modulus operator ( % ) returns the division remainder.

In arithmetic, the division of two integers produces a quotient and a remainder .

In mathematics, the result of a modulo operation is the remainder of an arithmetic division.

Incrementing

The increment operator ( ++ ) increments numbers.

Decrementing

The decrement operator ( -- ) decrements numbers.

Exponentiation

The exponentiation operator ( ** ) raises the first operand to the power of the second operand.

x ** y produces the same result as Math.pow(x,y) :

Operator Precedence

Operator precedence describes the order in which operations are performed in an arithmetic expression.

Is the result of example above the same as 150 * 3, or is it the same as 100 + 150?

Is the addition or the multiplication done first?

As in traditional school mathematics, the multiplication is done first.

Multiplication ( * ) and division ( / ) have higher precedence than addition ( + ) and subtraction ( - ).

And (as in school mathematics) the precedence can be changed by using parentheses.

When using parentheses, the operations inside the parentheses are computed first:

When many operations have the same precedence (like addition and subtraction or multiplication and division), they are computed from left to right:

For a full list of operator precedence values go to:

JavaScript Operator Precedence Values .

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Divide 10 by 2 , and alert the result.

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  11. Basic math in JavaScript

    Sometimes you might end up with a number that is stored as a string type, which makes it difficult to perform calculations with it. This most commonly happens when data is entered into a form input, and the input type is text.There is a way to solve this problem — passing the string value into the Number() constructor to return a number version of the same value.

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    Javascript (JS) is a object-oriented programming language which adhere to ECMA Script Standards. Javascript is required to design the behaviour of the web pages. Key Features Open-source Just-in-time compiled language Embedded along with HTML and makes web pages alive Originally named as LiveScript.

  16. JavaScript Objects

    What is this? In JavaScript, the this keyword refers to an object. Which object depends on how this is being invoked (used or called). The this keyword refers to different objects depending on how it is used: In an object method, this refers to the object. Alone, this refers to the global object. In a function, this refers to the global object.

  17. Node.js Masterclass Homework Assignment

    🛠 This repository contains the homework assignment for Node.js Master Class that is focused on building a RESTful API, web app GUI, and a CLI in plain Node JS with no NPM or 3rd-party libraries Topics. nodejs javascript cli node restful node-js restful-api Resources. Readme License. MIT license Activity. Stars. 234 stars

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    JavaScript Homework Help - Why JavaScript is useful? JavaScript is touted as the standard scripting language of the web. And, it is allegedly being used by over 95% of websites globally. ... JS complements a variety of other languages which can be used to build a variety of applications.

  22. MongoDB With Node.js

    MongoDB is a flexible, general-purpose document database that is ideally suited for modern applications.. Node.js is a JavaScript runtime that commonly powers web servers. Developers can use these two pieces of technology, along with MongoDB Atlas, a fully managed, multi-cloud database service, to rapidly create modern applications.

  23. JavaScript Arithmetic

    As in traditional school mathematics, the multiplication is done first. Multiplication ( *) and division ( /) have higher precedence than addition ( +) and subtraction ( - ). And (as in school mathematics) the precedence can be changed by using parentheses. When using parentheses, the operations inside the parentheses are computed first: