Underscore.js _.isNumeric() Method

The _.isNumeric() method checks whether the given value is a Numeric value or not, and returns the corresponding boolean value. It can be a string containing a numeric value, exponential notation or a Number object, etc. 

Syntax:

_.isNumeric( value );

Parameters:

• value: Given value to be checked for Numeric value.

Return Value: This method returns a Boolean value(Returns true if the given value is Numeric, 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 Numeric : "
    + _.isNumeric(10000));

Output:

The Value is Numeric : true

Example 2: An array will always return false. 

Javascript

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

// Checking
console.log("The Value is Numeric : "
    + _.isNumeric([1,10]));

Output:

The Value is Numeric : false

Example 3:

Javascript

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

// Checking
console.log("The Value is Numeric : "
    + _.isNumeric(2.333));

Output:

The Value is Numeric : true

Example 4: A string containing numeric value will return true.

Javascript

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

// Checking
console.log("The Value is Numeric : "
    + _.isNumeric("1000"));

Output:

The Value is Numeric : true