Frontend System Design
/Expert
Garbage Collection
Definition
Garbage Collection is an automated process in the V8 engine that frees up memory. It uses the 'Mark and Sweep' algorithm: it starts at the roots (global object), marks all reachable objects, and 'sweeps' (deletes) any objects that were not marked.
Explain Like I'm New
The Garbage Collector is a janitor who walks through your house holding a string attached to you. Any furniture the string can't reach is thrown in the trash.
Terminal Output
bash / terminal
Memory Leak Common Causes:
1. Accidental Global Variables
2. Forgotten setIntervals
3. Closures holding onto large objects
4. Detached DOM Elements (DOM nodes removed from document but still referenced in JS)
Interview Questions
basic
- Can you explain the basic concept of Garbage Collection?
- Why is Garbage Collection important in frontend system design?
intermediate
- How does Garbage Collection impact perceived performance and user experience?
- Describe a scenario where you had to debug an issue related to Garbage Collection.
advanced
- In a highly scaled enterprise system, how do you optimize Garbage Collection?
- What are the security implications of Garbage Collection?
trick
- Can Garbage Collection be entirely bypassed or disabled? What happens if it is?