JavaScript Tutorial in Hindi #39 | Memory Management & Garbage Collection

JavaScript Memory Management & Garbage Collection Explained | Mohit Decodes

In this video by Mohit Decodes, we dive deep into how memory is managed in JavaScript. You’ll learn about memory allocation, garbage collection, and how to avoid memory leaks in your web applications.

Whether you're a beginner or preparing for interviews, this session is crucial for understanding performance optimization in JS.

✅ Topics Covered:
How Memory is Allocated & Used in JavaScript
What is Garbage Collection?
Types of Garbage Collection Algorithms
Common Causes of Memory Leaks
Best Practices to Avoid Memory Leaks
Real-world Performance Tips

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Top Interview Questions: Memory Management & Garbage Collection (JavaScript):-

What is memory management in JavaScript? How does it work?
Expected: Explanation of how JavaScript automatically allocates and frees up memory via garbage collection.

What is garbage collection in JavaScript and how does it work internally?
Expected: Concept of reachability, mark-and-sweep algorithm, reference counting, etc.

What causes a memory leak in JavaScript applications?
Expected: Examples like unused variables, closures, detached DOM nodes, setInterval/setTimeout leaks.

How can you prevent or fix memory leaks in JavaScript?
Expected: Manual nullifying of references, removing event listeners, clearing intervals, using performance tools.

Explain the mark-and-sweep algorithm used in JavaScript garbage collection.
Expected: Memory is marked as “in use” if it can be reached; unused (unreachable) memory is swept away.

What tools or browser features do you use to detect memory issues?
Expected: Chrome DevTools → Performance tab, Memory tab (Heap Snapshot, Allocation instrumentation, etc.)


How does memory allocation work in JavaScript?
Expected: Allocation during variable declaration, object creation, function call stack, heap for objects.


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