Node.js util.types.isNumberObject() Method

Last Updated : 13 Oct, 2021

The util.types.isNumberObject() 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 value is a Number object or not.

Syntax

util.types.isNumberObject( value )

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

Return value: This method returns a Boolean value i.e true if the passed value is a Number object otherwise returns false.

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

Example 1:

// Node.js program to demonstrate the    
// util.types.isNumberObject() method 
  
// It includes util module 
const util = require('util'); 
  
// Returns false as it is not a number object 
console.log(util.types.isNumberObject(0)); 
  
// Returns true as it is a number object 
console.log(util.types.isNumberObject(new Number(0))); 

Output:

false
true

Example 2:

// Node.js program to demonstrate the    
// util.types.isNumberObject() method 
  
// It includes util module 
const util = require('util'); 
  
// Returns false becaluse it is not a number object 
console.log(util.types.isNumberObject(100)); 
  
// Returns true because it is a number object 
console.log(util.types.isNumberObject(new Number(12345678))); 
  
// returns false because it is not a number object 
console.log(util.types.isNumberObject(1.8)); 
  
// Returns true because it is a number object 
console.log(util.types.isNumberObject(new Number(1.8))); 
  
// Returns false as Number() method just convert 
// string to number not to Number Object 
console.log(util.types.isNumberObject(Number('1.8'))); 