Node.js | util.types.isSet() Method

The util.types.isSet() method of util module is primarily designed to support the needs of Node.js own Internal APIs. It is used to check whether the passed instance in the method is a built-in Set instance or not.

Syntax:

util.types.isSet( value )

Parameters: This method accepts a single parameter value which holds any value i.e instance of any module.

Return value: This method returns a Boolean value i.e true if the passed value is a built-in instance of Set otherwise returns false.

Below examples illustrate the use of util.types.isSet() method in Node.js:

Example 1:

// Node.js program to demonstrate the     
// util.types.isSet() method  
    
// It includes util module  
const util = require('util');  
    
// Return true as passed instance is of Set 
console.log(util.types.isSet(new Set()));  
    
// Return false as passed instance is of Map 
console.log(util.types.isSet(new Map()));  

Output:

true
false

Example 2:

// Node.js program to demonstrate the     
// util.types.isSet() method  
    
// It includes util module  
const util = require('util');  
    
// Making a set object of a string 
var set1 = new Set("geeksforgeeks"); 
  
// Return true as passed instance is of Set 
console.log(util.types.isSet(set1)); 
  
const numbers = [2, 3, 4, 4, 2, 3, 3, 4, 
       4, 5, 5, 6, 6, 7, 5, 32, 3, 4, 5]; 
  
// Making a set object of array 
var set2 = new Set(numbers); 
  
// Return true as passed instance is of Set 
console.log(util.types.isSet(set2));  
    
// Return false as passed instance is of Map 
console.log(util.types.isSet(new Map()));  

Output:

true
true
false

Reference: https://nodejs.org/api/util.html#util_util_types_isset_value

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