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.

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.

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.

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.