JavaScript WeakMap Object

The JavaScript WeakMap object is a type of collection which is almost similar to Map. It stores each element as a key-value pair where keys are weakly referenced. Here, the keys are objects and the values are arbitrary values.

Syntax

Parameter

iterable - It represents an array and other iterable object whose elements are in the form of key-value pair.

Points to remember

• A WeakMap object allows the keys of object type only.
• In WeakMap, if there is no reference to a key object, they are targeted to garbage collection.
• In WeakMap, the keys are not enumerable. So, it doesn't provide any method to get the list of keys.
• A WeakMap object iterates its elements in insertion order.

JavaScript WeakMap Methods