JavaScript Interview Questions

Q61 What is Service Worker? ✓ Answered → Q62 Explain JavaScript module bundling. ✓ Answered → Q63 What is tree shaking? ✓ Answered → Q64 Explain functional programming in JavaScript. ✓ Answered → Q65 What is composition over inheritance? ✓ Answered → Q66 Explain Proxy object. ✓ Answered → Q67 What is Reflect API? ✓ Answered → Q68 Explain Symbol data type. ✓ Answered → Q69 What is tail call optimization? ✓ Answered → Q70 Explain performance optimization techniques. ✓ Answered → Q71 What is SSR vs CSR? ✓ Answered → Q72 How to prevent memory leaks? ✓ Answered → Q73 Explain advanced async patterns. ✓ Answered → Q74 What is dynamic import()? ✓ Answered → Q75 Explain module federation. ✓ Answered → Q76 What is polyfill? ✓ Answered → Q77 Explain browser rendering pipeline. ✓ Answered → Q78 What is IntersectionObserver? ✓ Answered → Q79 Explain requestAnimationFrame. ✓ Answered → Q80 What is WebSocket? ✓ Answered →