Learn JAVASCRIPT with Real Code Examples
Updated Nov 21, 2025
Installation Setup
No installation needed for browser use
Create `.js` files using any text editor
Include JS in HTML via `<script>` tag
Use Node.js for server-side execution
Optionally use package managers like npm or yarn
Environment Setup
Text editor or IDE (VS Code, Sublime)
Browser for testing
Node.js installed for server-side execution
Package manager like npm or yarn
Browser dev tools for debugging
Config Files
.js files for scripts
package.json for Node.js projects
webpack.config.js for bundling
.eslintrc.json for linting
Optional .babelrc for transpiling
Cli Commands
node file.js - run JS on Node.js
npm install package - install dependencies
npx commands - run CLI tools
eslint . - lint project
webpack - bundle JS for production
Internationalization
Format dates/numbers with Intl API
Support multiple languages via i18n libraries
Right-to-left content handling
Dynamic language switching for UI
Localization of string content and formatting
Accessibility
Ensure focus management
Add keyboard event handling
Use ARIA attributes via JS
Dynamic content updates should be announced
Avoid blocking assistive technologies with JS loops
Ui Styling
Manipulate CSS via style property or classList
Add/remove elements dynamically
Handle events for interactive UI
Animate elements via JS or requestAnimationFrame
Integrate with CSS frameworks for styled components
State Management
DOM state managed via JS variables and data structures
Front-end frameworks offer structured state management (Redux, Vuex)
Async operations update state dynamically
Events trigger state changes
LocalStorage/sessionStorage for persistent client state
Data Management
Arrays and objects for structured data
JSON for data interchange
Fetch API or AJAX for server communication
IndexedDB or LocalStorage for client-side storage
Server-side integration with databases via Node.js