Memory Management
High-level overview of memory allocation strategies and best practices for developers.
Short explanation
Memory management in JS involves allocating objects on the heap, tracking references, and relying on garbage collection to reclaim unreachable memory. Developers should be mindful of references that cause unintended retention.
Small snippet
let arr = [];
for (let i = 0; i < 1000; i++) {
arr.push(new Array(1000).fill(i));
}
// If arr remains in scope, memory usage stays high
How JS handles it internally
Engines perform garbage collection using generational and incremental algorithms to reduce pause times. Objects referenced by closures or global scopes remain reachable and won't be collected.
Diagram
Related
🔗 Related:
FAQ
Q: How can I avoid memory leaks?
A: Avoid global references, large caches without eviction, DOM references retained in JS, and ensure event listeners are removed when no longer needed.