JavaScript Formatter

JavaScript Formatting Standards

Modern JavaScript follows ESLint and Prettier standards for consistent code formatting. Our formatter applies industry-standard rules including 2-space indentation, semicolon usage, single quotes for strings, and proper spacing around operators. Consistent formatting improves code review efficiency and reduces merge conflicts.

ES6+ Modern JavaScript Features

• Arrow Functions: Concise syntax with lexical this binding: const add = (a, b) => a + b
• Destructuring: Extract values from objects and arrays: const {name, age} = user
• Template Literals: String interpolation with backticks: \Hello \\
• Async/Await: Cleaner asynchronous code than promises: async function fetchData() { await api.get() }
• Spread Operator: Array and object manipulation: const newArray = [...oldArray, newItem]
• Optional Chaining: Safe property access: user?.address?.city

JavaScript Best Practices

Use const by default, let when reassignment is needed, avoid var. Prefer arrow functions for callbacks and methods. Use strict equality (===) instead of loose equality (==). Handle errors with try/catch blocks. Avoid global variables and use modules for code organization. Comment complex logic but let code be self-documenting.

JavaScript Performance Optimization

Minimize DOM manipulation by batching updates. Use event delegation instead of multiple event listeners. Debounce and throttle expensive operations like scroll and resize handlers. Lazy load modules with dynamic imports. Use Web Workers for CPU-intensive tasks. Profile with Chrome DevTools to identify bottlenecks.

Common JavaScript Patterns

Module Pattern encapsulates private variables and methods. Observer Pattern for event-driven architecture. Factory Pattern for object creation. Singleton Pattern for single instances. Promise Pattern for asynchronous operations. Our formatter preserves these patterns while ensuring consistent code style.

JavaScript Frameworks and Libraries

React, Vue, and Angular dominate modern web development. React uses JSX syntax mixing HTML and JavaScript. Vue uses single-file components with template, script, and style sections. Angular uses TypeScript with decorators and dependency injection. Our formatter works with all frameworks while maintaining their specific syntax requirements.

TypeScript Integration

TypeScript adds static typing to JavaScript, catching errors at compile time. Use interfaces for object shapes, types for unions and intersections, and generics for reusable components. TypeScript improves IDE autocomplete and refactoring. Our formatter handles both JavaScript and TypeScript syntax including type annotations.