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

• Example:
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  <script>       function gfg() {       const A = new WeakSet();     const object = {};     A.add(object);     document.write(A.has(object));      }       gfg();   </script>

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• Output:

  true

The weakSet.has() is an inbuilt function in JavaScript which is used to return a boolean value indicating whether an object is present in a weakSet or not. The WeakSet object lets you store weakly held objects in a collection.

Syntax:

weakSet.has(A);

Parameters: It accepts the parameter “A” which is a value going to be checked whether it is present in the weakSet object or not.

Return Values: It returns boolean value true if the element is present otherwise it returns false.

Example:

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

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

Output:

true

Here output is true because the object “object1” is present in the WeakSet() object.
Code #2:

Output:

false

Here output is false because the object “object1” is not present in the WeakSet() object.

Supported Browsers:

• Google Chrome
• Internet Explorer
• Firefox
• Apple Safari
• Opera