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JavaScript weakMap.delete() Method
  • Last Updated : 18 Sep, 2020

Below is the example of weakMap.delete() method.

  • Example:




    <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:




<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:




<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.

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