JavaScript WeakMap 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 between 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

function gfg() {
    const weakmap1 = new WeakMap();
    const key1 = {};
    weakmap1.set(key1, 12);
    console.log(weakmap1.get(key1));
}
gfg();

Output:

12

The complete list of JavaScript WeakMap is listed below:

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

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

JavaScript WeakMap Properties: A JavaScript property is a member of an object that associates a key with a value. 

• Instance Properties: If the property is called on the instance of a WeakMap then it is called instance property.

Instance Property	Description	Example
constructor	It is used to return the constructor function of WeakMap	Try

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 WeakMap then it is called an instance method.

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