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: JavaScript 
// 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: JavaScript 
// 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')));
Output: 
false
true
false
true
false
Reference: https://nodejs.org/api/util.html#util_util_types_isnumberobject_value
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