JavaScript weakMap delete() Method

The weakMap.delete() is an inbuilt function in JavaScript which is used to delete a particular element from an 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 from 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.

Below are examples of weakMap.delete() method. 

Example 1:  

function gfg() { 
    const weakmap = new WeakMap(); 

    const key = {}; 
    weakmap.set(key, 6); 

    console.log(weakmap.delete(key)); 
} 
gfg(); 

Output:  

true

Example 2:  

// 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 
console.log(key1, 6);

// Deleting key of the element from
// the weakMap object
console.log(weakmap1.delete(key1));

Output: 

true

Example 3: 

// Creating a WeakMap() object
const weakmap1 = new WeakMap();

// Creating a key "key1"
const key1 = {};

// Deleting key of the element from
// the weakMap object
console.log(weakmap1.delete(key1));

Output: 

false

Explanation: 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

We have a complete list of Javascript weakMap methods, to check those please go through this JavaScript WeakMap Complete Reference article.

We have a Cheat Sheet on Javascript where we covered all the important topics of Javascript to check those please go through Javascript Cheat Sheet-A Basic guide to JavaScript.