JavaScript | weakMap.delete() - Tutorialspoint.dev

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.

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> 

/div>

Output:

false

Here output is false because the key “key1” with any value has not been set to the end of the weakMap object.

JavaScript | weakMap.delete()

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