JavaScript WeakMap Complete Reference

JavaScript WeakMap object in JavaScript is used to store the collection of objects (key-value pairs) in which keys are weakly referenced. The major difference of a WeakSet with a set is that a WeakSet is a collection of objects and not values of some particular type.

Syntax:

WeakMap.function();

Example: Below is the example of weakMap.get() method.

Javascript

<script>
    function gfg() {

    const weakmap1 = new WeakMap();

    const key1 = {};

    weakmap1.set(key1, 12);

    console.log(weakmap1.get(key1));
        }
        gfg();
</script>

Output:

12

JavaScript WeakMap Constructor: A constructor gets called when an object is created using the new keyword.

Constructor	Description
weakMap()	A constructor gets called when an object is created using the new keyword.

JavaScript WeakMap Properties: A JavaScript property is a member of an object that associates a key with a value. There is no property in the weakMap.

JavaScript WeakMap Methods: JavaScript methods are actions that can be performed on objects.

• Instance Method: If the method is called on an instance of a number then it is called an instance method.

Instance Methods	Description
delete()	Delete a particular element from an object WeakMap.
get()	Return a particular element from an object WeakMap.that
has()	Return a boolean value that indicates whether an element with a particular key presents in the weakmap object or not.
set()	Set a new element with a particular key and value to a WeakMap object.

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