JavaScript weakMap.delete() Method
Below is the example of weakMap.delete() method.
- Example:
javascript
<script> function gfg() {const weakmap = new WeakMap();const key = {};weakmap.set(key, 6);document.write(weakmap.delete(key)); } gfg();</script> |
- Output:
true
The weakMap.delete() is an inbuilt function in JavaScript which is used to delete a particular element from a object WeakMap.
Syntax:
weakMap.delete(key);
Parameters: It accepts a parameter “key” which is the key of the element which is going to be deleted form the object weakMap.
Return values: It returns true if that element has been deleted from the weakMap object and false if that key is not present in the weakMap object.
Example:
Input: weakmap1.delete(key1) Output: true
JavaScript code to show the working of this function:
Code #1:
javascript
<script> // Creating a WeakMap() object const weakmap1 = new WeakMap(); // Creating a key "key1" const key1 = {}; // Setting the value 6 with key1 to the // the end of weakMap object weakmap1.set(key1, 6); // Deleting key of the element from // the weakMap object document.write(weakmap1.delete(key1));</script> |
Output:
true
Here output is true it means that key of the element has been deleted successfully.
Code #2:
javascript
<script> // Creating a WeakMap() object const weakmap1 = new WeakMap(); // Creating a key "key1" const key1 = {}; // Deleting key of the element from // the weakMap object document.write(weakmap1.delete(key1));</script> |
Output:
false
Here output is false because the key “key1” with any value has not been set to the end of the weakMap object.
Supported Browser:
- Chrome 36 and above
- Edge 12 and above
- Firefox 6 and above
- Internet Explorer 11 and above
- Opera 23 and above
- Safari 8 and above
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