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Think of WeakMap as a self-cleaning storage unit! It stores key-value pairs just like Map, but with a superpower: when the object used as a key is no longer needed anywhere else in your code, WeakMap automatically deletes that entry. No memory leaks!
Keys must be objects. Can't use strings, numbers, or primitives as keys!
When a key object is garbage collected, its entry is automatically removed!
Can't loop through or get all keys/values. No size property!
Perfect for storing metadata about objects without preventing garbage collection!
set(key, value)Add or update (key must be object)
get(key)Get value by object key
has(key)Check if key exists
delete(key)Remove entry manually
Store metadata about objects without memory leaks
Cache expensive computations without worrying about cleanup
Keys must be objects. Strings, numbers, booleans won't work!
No .size, no .keys(), no .forEach(). Can't loop through entries!
Entries are automatically removed when keys are garbage collected
Keys must be objects - no primitives allowed
Perfect for storing metadata without memory leaks
Can't loop or get size - limited API for memory safety