Memory

Summary

How JavaScript allocates memory for variables and objects (stack for primitives, heap for objects) — understanding this helps you reason about performance and leaks. JavaScript engines manage memory automatically, but developers still need to understand references and object lifetime to diagnose excessive allocation and leaks.

• 1Read a short explainer on the JS memory heap vs stack. Then apply the idea in a small example so the theory becomes practical.
• 2Use Chrome DevTools' Memory tab to take a heap snapshot of a page. Verify the behavior with realistic data and handle the failure or empty state as well.
• 3Learn what commonly causes memory leaks in JS apps (detached DOM nodes, forgotten listeners).