Underscore.js _.isInteger() Method

The _.isInteger() Method checks whether the given value is an Integer value or not and returns the corresponding boolean value.

Syntax:

_.isInteger( value );

Parameters:

• value: Given value to be checked for the Integer value.

Return Value: This method returns a Boolean value(Returns true if the given value is Integer, else false).

Note: This will not work in normal JavaScript because it requires the underscore.js contrib library to be installed. Underscore.js contrib library can be installed using npm install underscore-contrib .

Example 1:

Javascript

// Defining underscore contrib variable
var _ = require('underscore-contrib');

// Checking
console.log("The Value is Integer : "
    + _.isInteger(-4));

Output:

The Value is Integer : true

Example 2:

Javascript

// Defining underscore contrib variable
var _ = require('underscore-contrib');

// Checking
console.log("The Value is Integer : "
    + _.isInteger(4.2));

Output:

The Value is Integer : false

Example 3: For this method values 4.0 and 4 both will be considered as an integer, so this method will return true.

Javascript

// Defining underscore contrib variable
var _ = require('underscore-contrib');

// Checking
console.log("The Value is Integer : "
    + _.isInteger(4.0));

Output:

The Value is Integer : true

Example 4: A string containing an Integer value will return true.

Javascript

// Defining underscore contrib variable
var _ = require('underscore-contrib');

// Checking
console.log("The Value is Integer : "
    + _.isInteger("4"));

Output:

The Value is Integer : true