JavaScript Roadmap

JavaScript, often abbreviated JS, is a programming language that is one of the core technologies of the World Wide Web, alongside HTML and CSS. It lets us add interactivity to pages e.g. you might have seen sliders, alerts, click interactions, popups, etc on different websites — all of that is built using JavaScript...

Apart from being used in the browser, it is also used in other non-browser environments as well such as Node.js for writing server-side code in JavaScript, Electron for writing desktop applications, React Native for mobile applications, and so on.

1. Introduction to JavaScript

1.1 Basics

• Syntax and Basics
  • Variables: var, let, const
  • Data Types: Strings, Numbers, Booleans, Arrays, Objects
  • Operators: Arithmetic, Assignment, Comparison, Logical
• Control Structures
  • Conditional Statements: if, else, else if, switch
  • Loops: for, while, do...while
• Functions
  • Function Declaration and Invocation
  • Parameters and Return Values
  • Arrow Functions

1.2 Advanced Basics

• Scope and Closures
• Global vs Local Scope
• Closure Concepts
• Error Handling
• try, catch, finally, throw
• Asynchronous JavaScript
• Callbacks
• Promises
• async/await

2. JavaScript in the Browser

2.1 DOM Manipulation

• Document Object Model (DOM)
• Selecting Elements: getElementById, querySelector, getElementsByClassName, etc.
• Manipulating Elements: innerHTML, textContent, classList, etc.
• Event Handling
• Adding Event Listeners: addEventListener
• Common Events: click, submit, mouseover, etc.

2.2 Browser APIs

• Fetch API
• Making HTTP Requests: fetch()
• Handling Responses and Errors
• Web Storage API
• Local Storage
• Session Storage

3. Advanced JavaScript

3.1 Object-Oriented Programming

• Classes
• Class Syntax and Constructors
• Inheritance
• Methods and Properties
• Prototypes
• Prototype Chain
• Inheritance with Prototypes

3.2 Functional Programming

• Higher-Order Functions
• Functions as First-Class Citizens
• Array Methods: map, filter, reduce, forEach
• Immutability and Pure Functions
• Concepts of Functional Programming

4. JavaScript Frameworks and Libraries

4.1 Front-End Frameworks

• React
• JSX
• Components
• State and Props
• Lifecycle Methods
• Vue
• Vue Instance
• Directives
• Components
• Vue Router

4.2 Back-End Frameworks

• Node.js
• Introduction to Node.js
• Modules and NPM
• Creating a Server
• Express.js
• Routing
• Middleware
• RESTful APIs

5. Tooling and Ecosystem

5.1 Package Managers

• npm
• Installing and Using Packages
• package.json
• yarn
• Installing and Using Packages
• yarn.lock

5.2 Build Tools

• Webpack
• Configuring Webpack
• Loaders and Plugins
• Babel
• Transpiling JavaScript
• Configuring Babel

5.3 Linters and Formatters

• ESLint
• Configuring ESLint
• Common Rules and Best Practices
• Prettier
• Auto-formatting Code

6. Testing

6.1 Unit Testing

• Jest
• Writing Tests
• Mocking and Assertions
• Mocha and Chai
• Writing Tests
• Assertions and Setup

6.2 End-to-End Testing

• Cypress
• Writing E2E Tests
• Running Tests
• Selenium
• Writing Tests
• Configuring WebDriver

7. Best Practices

7.1 Code Quality

• Clean Code Principles
• Code Reviews
• Refactoring

7.2 Performance Optimization

• Efficient DOM Manipulation
• Minimizing Reflows and Repaints
• Lazy Loading and Code Splitting

8. Advanced Topics

8.1 TypeScript

• Introduction to TypeScript
• Types and Interfaces
• TypeScript Compiler
• TypeScript with React
• Typing Props and State

8.2 WebAssembly

• Introduction to WebAssembly
• Compiling to WebAssembly
• Using WebAssembly in JavaScript

8.3 Progressive Web Apps (PWAs)

• Service Workers
• Caching Strategies
• Offline Support
• Manifest Files
• Creating a Manifest File
• Adding to Homescreen

9. Resources

9.1 Documentation and Tutorials

• MDN Web Docs
• W3Schools
• JavaScript.info

9.2 Community and Support

• Stack Overflow
• Reddit
• Discord and Slack Channels

This roadmap should provide a comprehensive guide to learning and mastering JavaScript, from the basics to advanced topics and best practices.