JavaScript weakSet.add() Method

Below is the example of weakSet.add() method.

• Example:

  <script>
      function gfg() {
      const weakset = new WeakSet();
  
      const object1 = {};
      weakset.add(object1);
      document.write(weakset.has(object1));
      }
      gfg();
  </script>
• Output:

  true

The weakSet.add() is an inbuilt function in JavaScript which is used to add an object at the end of the a object WeakSet. The WeakSet object lets you store weakly held objects in a collection.

Syntax:

weakSet.add(A);

Parameters: It accepts the parameter “A” which is a value going to be added to the weakset object.

Return Values: It returns the weakset object.

Example:

Input: weakset.add(object1); 
Output: true

JavaScript code to show the working of the this function:
Code #1:

<script>

    // Constructing a weakset object
    const weakset = new WeakSet();

    // Constructing a new object object1
    const object1 = {};
    const object2 = {};
    const object3 = {};
    const object4 = {};

    // Adding the object1 at the end of the weakset object.
    weakset.add(object1);
    weakset.add(object2);
    weakset.add(object3);
    weakset.add(object4);

    // Printing either object has been added or not
    document.write(weakset.has(object1) +"<br>");
    document.write(weakset.has(object2) +"<br>");
    document.write(weakset.has(object3) +"<br>");
    document.write(weakset.has(object4));

</script>

Output:

true
true
true
true

Code #2:

<script>

    // Constructing a weakset object
    const weakset = new WeakSet();

    // Constructing a new object object1
    const object1 = {};
    const object2 = {};
    const object3 = {};
    const object4 = {};

    // Printing either object has been added or not
    document.write(weakset.has(object1) +"<br>");
    document.write(weakset.has(object2) +"<br>");
    document.write(weakset.has(object3) +"<br>");
    document.write(weakset.has(object4));

</script>

Output:

false
false
false
false

Here the output is false because the new created objects has not been set to the end of the weakSet() object.

Supported Browsers:

• Google Chrome 36 and above
• Firefox 34 and above
• Apple Safari 9 and above
• Opera 23 and above
• Edge 12 and above