JavaScript Cheat Sheet

Comprehensive JavaScript reference covering syntax, functions, objects, arrays, async programming, DOM manipulation, and modern ES6+ features with practical code examples.

📚 Quick Navigation

📦 Variables & Data Types 🔧 Operators 🔀 Control Flow ⚡ Functions 📋 Objects & Arrays 🏗️ Classes & Prototypes ⏳ Async Programming ⚠️ Error Handling 📝 String Methods 📊 Array Methods 📅 Math & Date Objects 🚀 Modern JavaScript (ES6+)🔍 Regular Expressions 🌐 DOM Manipulation 🌍 Fetch API & HTTP 💾 Browser Storage

JavaScript Best Practices

✅ Use Strict Mode

Start files with 'use strict'; to catch common mistakes

🔒 Use const by default

Use const for variables that don't change, let for those that do

⚡ Prefer arrow functions

Shorter syntax and lexical this binding

🎯 Use === instead of ==

Strict equality prevents type coercion bugs

🔄 Use async/await

Cleaner than Promises for async operations

📦 Use modules

Import/export for better code organization

JavaScript cheat sheet covering ES6+ features and modern best practices

📖 Comprehensive 💾 Copy-Paste Ready 🔍 Searchable 📱 Mobile Friendly