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JavaScript Features List

1. Core Language Features

  • Dynamic Typing
  • First-Class Functions
  • Prototype-Based Inheritance
  • Hoisting
  • Closures
  • Asynchronous Programming (Promises, async/await)
  • Lexical Scoping
  • Block Scoping (let & const)
  • Spread and Rest Operators
  • Destructuring Assignment
  • Template Literals
  • Optional Chaining (?.)
  • Nullish Coalescing Operator (??)
  • Symbol Data Type
  • BigInt Support

2. Object-Oriented Programming (OOP)

  • Constructor Functions
  • Classes and Inheritance (ES6 Class Syntax)
  • Encapsulation using Closures
  • Private and Public Class Fields
  • Getters and Setters
  • Method Chaining
  • Mixins

3. Functional Programming Features

  • Higher-Order Functions
  • Pure Functions
  • Immutability
  • Currying
  • Partial Application
  • Composition
  • Array Methods (map, filter, reduce, forEach, etc.)
  • Function Binding (bind, call, apply)

4. Asynchronous and Event-Driven Features

  • Event Loop
  • Callbacks
  • Promises
  • Async/Await
  • Event Listeners
  • Web Workers
  • Observables (RxJS)

5. Data Structures and Built-in Objects

  • Arrays and Typed Arrays
  • Sets and WeakSets
  • Maps and WeakMaps
  • Objects
  • JSON Parsing and Stringification
  • Date and Time Handling
  • Regular Expressions (RegExp)

6. Modules and Package Management

  • ES6 Modules (import/export)
  • CommonJS Modules (require/module.exports)
  • Dynamic Imports
  • NPM (Node Package Manager)

7. Error Handling and Debugging

  • Try…Catch…Finally
  • Error Object (Custom Errors)
  • Debugging using Console and DevTools
  • Strict Mode (‘use strict’)
  • Assertions

8. DOM Manipulation and Browser APIs

  • Document Object Model (DOM) Manipulation
  • Fetch API
  • Local Storage, Session Storage, and IndexedDB
  • WebSockets
  • Canvas API
  • Geolocation API
  • Notification API
  • Drag and Drop API
  • History API

9. Performance and Optimization Features

  • Debouncing and Throttling
  • Lazy Loading
  • Tree Shaking
  • Code Splitting
  • WebAssembly (WASM)
  • Service Workers for Caching

10. Security Features

  • Content Security Policy (CSP)
  • Same-Origin Policy
  • Cross-Origin Resource Sharing (CORS)
  • Secure Contexts (HTTPS-only Features)
  • Avoiding Prototype Pollution

11. Modern JavaScript Features (ES6+)

  • Default Parameters
  • Rest and Spread Operators
  • Arrow Functions
  • Enhanced Object Literals
  • Optional Chaining
  • Nullish Coalescing
  • Dynamic Imports
  • Private Class Fields

12. Meta-Programming Features

  • Reflection (Reflect API)
  • Proxies
  • Generators and Iterators

13. Testing and Automation Features

  • Unit Testing Frameworks (Jest, Mocha, Jasmine)
  • End-to-End Testing (Cypress, Puppeteer, Playwright)
  • Code Coverage Analysis
  • Mocking and Spies

14. Internationalization and Localization Features

  • Intl API for Formatting Dates, Numbers, and Strings
  • Unicode Support
  • Right-to-Left (RTL) Text Handling
  • Pluralization and Translations
  • Timezone Management

References

This content is unique and compiled based on personal knowledge. If referencing, ensure compliance with the original sources of JavaScript documentation (e.g., MDN Web Docs, ECMA).