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

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// Defining underscore contrib variable
var _ = require('underscore-contrib'); 
  
// Checking
console.log("The Value is Numeric : " 
    + _.isNumeric(10000)); 

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Output:

The Value is Numeric : true

Example 2: An array will always return false. 

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// Defining underscore contrib variable
var _ = require('underscore-contrib'); 
  
// Checking
console.log("The Value is Numeric : " 
    + _.isNumeric([1,10])); 

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Output:

The Value is Numeric : false

Example 3: 

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// Defining underscore contrib variable
var _ = require('underscore-contrib'); 
  
// Checking
console.log("The Value is Numeric : " 
    + _.isNumeric(2.333)); 

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Output:

The Value is Numeric : true

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

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// Defining underscore contrib variable
var _ = require('underscore-contrib'); 
  
// Checking
console.log("The Value is Numeric : " 
    + _.isNumeric("1000")); 

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Output:

The Value is Numeric : true

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