Advanced JavaScript Patterns

Why Advanced Patterns Matter

Beyond basic syntax, modern JavaScript requires understanding execution context, closures, and framework optimizations. This tutorial covers essential patterns that solve real-world problems in large-scale applications.

Core Concepts

Module Pattern

✓ Encapsulation
✓ Namespacing

Factory Design

✓ Object creation patterns
✓ Dependency injection

Performance Optimization


function debounce(func, delay) {
  let timeout;
  return (...args) => {
    clearTimeout(timeout);
    timeout = setTimeout(() => {
      func.apply(this, args);
    }, delay);
  };
}

// Usage
const resized = debounce((e) => {
  console.log(window.innerWidth);
}, 300);

window.addEventListener('resize', resized);

This pattern optimizes event handling by coalescing frequent triggers. Use in scroll/resize handlers and search inputs.

Best Practices

✓ Use Proxy objects for state validation
✓ Prioritize async/await over callbacks
✓ Memorize expensive computations

Modern Framework Patterns

React Context Optimization

• useContext + useMemo

Vue Composition API

• Reactive objects

Memory Management

Garbage Collection

JavaScript's GC tracks live/unused objects through reference counting and mark-sweep algorithms

Optimization Tips

• WeakMap for temporary storage