Underscore.js _.isSequential() Method

The _.isSequential() Method checks whether the given value is a Sequential composite type value or not, Exp. arrays, arguments, etc. correspondingly returning a boolean value.

Syntax:

_.isSequential(value);

Parameters: This method accepts a single parameter as mentioned above and described below:

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

Return Value: This method returns a Boolean value(Returns true if the given value is Sequential, 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 –save.

Example 1:

Javascript

// Defining underscore contrib variable
var _ = require('underscore-contrib');
// Checking
console.log("The Value is Sequential : " +_.isSequential([1, 2, 3, 4]));

Output:

The Value is Sequential : true

Example 2: A mapping returns false.

Javascript

// Defining underscore contrib variable
var _ = require('underscore-contrib');
// Checking
console.log("The Value is Sequential : " +_.isSequential({1:2, 3:4}));

Output:

The Value is Sequential : false

Example 3: For string, this method returns false

Javascript

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

Output:

The Value is Sequential : false