JavaScript weakSet has() Method

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JavaScript weakSet.has() method is used to return a boolean value indicating whether an object is present in a weakSet or not. The WeakSet object lets you store weakly held objects in a collection.

Syntax:

weakSet.has(value);

Parameters: This method accepts a single parameter value.

value: This value is going to be checked whether it is present in the weakSet object or not.

Return Values: It returns a boolean value true if the element is present otherwise it returns false.

Below are examples of weakSet.has() method:

Example 1:

javascript

function gfg() { 
    const A = new WeakSet(); 
    const object = {}; 
    A.add(object); 
    console.log(A.has(object)); 
} 
gfg();

Output: Here output is true because the object “object” is present in the WeakSet() object.

true

Example 2:

javascript

// Constructing a weakSet() object 
const A = new WeakSet(); 
  
// Constructing new objects 
const object1 = {}; 
  
// Adding the new object to the weakSet 
A.add(object1); 
  
// Checking whether the new object is present 
// in the weakSet or not 
console.log(A.has(object1));

Output: Here output is true because the object “object1” is present in the WeakSet() object.

true

Example 3:

javascript

// Constructing a weakSet() object 
const A = new WeakSet(); 
  
// Constructing new objects 
const object1 = {}; 
  
// Checking whether the new object is present 
// in the weakSet or not 
console.log(A.has(object1));

Output: Here the output is false because the object “object1” is not present in the WeakSet() object.

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 this JavaScript WeakSet Complete Reference article.

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