Understanding JavaScript Memory Management

JavaScript Memory Lifecycle

Memory Allocation in JavaScript

Primitive and Reference Types

Stack and Heap Memory Allocation

Example of Memory Allocation

let a = 10; // Stored in stacklet obj = { name: "John" }; // Object stored in heap, reference stored in stack

Understanding JavaScript Garbage Collection(GC)

Mark-and-Sweep Algorithm

Reference Counting and Cyclic References

let obj1 = {};let obj2 = {};obj1.ref = obj2;obj2.ref = obj1; // Neither object is eligible for garbage collection

Common Memory Issues and Leaks

Unintended Global Variables

function myFunc() {    name = "John"; // Implicit global variable (memory leak)}

Closures Holding References

function outer() {    let bigData = new Array(1000000); // Large array    return function inner() {        console.log(bigData.length);    };}let closure = outer(); // `bigData` is not garbage collected

Detached DOM Elements

let button = document.getElementById("myButton");button.addEventListener("click", function() {    console.log("Clicked");});button.remove(); // Event listener may still hold reference to the button

Caching Issues and Memory Bloat

Best Practices for Efficient Memory Management

let wm = new WeakMap();let obj = {};wm.set(obj, "value");obj = null; // Object is garbage collected

function cleanup() {    document.getElementById("myButton").removeEventListener("click", handler);}

Tools for Monitoring and Debugging Memory Usage

Chrome DevTools Memory Panel

Heap Snapshots and Memory Profiling

Performance Audits with Lighthouse

Conclusion