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

Last Updated : 28 Jan, 2020

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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