JavaScript weakSet.has() Method
Below is the example of weakSet.add() method.
- Example:
<script>functiongfg() {const A =newWeakSet();const object = {};A.add(object);document.write(A.has(object));}gfg();</script> - 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:
<script> // Constructing a weakSet() object const A = new WeakSet(); // Constructing new objects const object1 = {}; // Adding the new object to the weakSet A.add(object1); // Checking whether the new object is present // in the weakSet or not document.write(A.has(object1) +"<br>"); </script> |
Output:
true
Here output is true because the object “object1” is present in the WeakSet() object.
Code #2:
<script> // Constructing a weakSet() object const A = new WeakSet(); // Constructing new objects const object1 = {}; // Checking whether the new object is present // in the weakSet or not document.write(A.has(object1) +"<br>"); </script> |
Output:
false
Here output is false because the object “object1” is not present in 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
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