List down the collection of methods available on WeakMap

Below are the list of methods available on WeakMap,

1. set(key, value): Sets the value for the key in the WeakMap object. Returns the WeakMap object.
2. delete(key): Removes any value associated to the key.
3. has(key): Returns a Boolean asserting whether a value has been associated to the key in the WeakMap object or not.
4. get(key): Returns the value associated to the key, or undefined if there is none.

Let's see the functionality of all the above methods in an example,

      var weakMapObject = new WeakMap();
      var firstObject = {};
      var secondObject = {};
      // set(key, value)
      weakMapObject.set(firstObject, "John");
      weakMapObject.set(secondObject, 100);
      console.log(weakMapObject.has(firstObject)); //true
      console.log(weakMapObject.get(firstObject)); // John
      weakMapObject.delete(secondObject);