Javascript weakSet.add() is used to add an object at the end of the object WeakSet. The WeakSet object lets you store weakly held objects in a collection.
Syntax:
weakSet.add(A);
Parameters: This method accepts a single parameter value.
- value: This value will be added to the weakset object.
Return Values: It returns the newly added weakset object.
Below are examples of weakSet.add() method:
Example 1: This is a basic example of weakset.add() method in javascript.
javascript
function gfg() { const weakset = new WeakSet(); const object1 = {}; weakset.add(object1); console.log(weakset.has(object1));}gfg(); |
true
Example 2: Here the output is true because the newly created objects have been set to the end of the weakSet() object.
javascript
// Constructing a weakset objectconst weakset = new WeakSet();// Constructing a new object object1const 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 notconsole.log(weakset.has(object1));console.log(weakset.has(object2));console.log(weakset.has(object3));console.log(weakset.has(object4)); |
true true true true
Example 3: Here the output is false because the newly created objects have not been set to the end of the weakSet() object.
javascript
// Constructing a weakset objectconst weakset = new WeakSet();// Constructing a new object object1const object1 = {};const object2 = {};const object3 = {};const object4 = {};// Printing either object has been added or notconsole.log(weakset.has(object1));console.log(weakset.has(object2));console.log(weakset.has(object3));console.log(weakset.has(object4)); |
false false false false
Supported Browsers:
- Google Chrome 36 and above
- Firefox 34 and above
- Apple Safari 9 and above
- Opera 23 and above
- Edge 12 and above
We have a complete list of Javascript WeakSet methods, to check those please go through Javascript WeakSet Complete reference article.
