Lodash _.isSequential() Function

Lodash is a JavaScript library that works on the top of underscore.js. Lodash helps in working with arrays, strings, objects, numbers, etc.

The _.isSequential() method is used to check whether the given value is a sequential composite type value or not. The examples of a sequential composite type are arrays and arguments.

Syntax:

_.isSequential( value )

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

• value: It is the value to be checked for a sequential type of value.

Return Value: This method returns a Boolean value. It returns true if the given value is a sequential type, otherwise, it returns false.

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

Example 1: In this example, an array is checked with this method.

Javascript

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

// Using the _.isSequential() method
console.log("The Value is Sequential : " +
  _.isSequential([2, 4, 6, 8]));

Output:

The Value is Sequential : true

Example 2: In this example, an object with key-value pairs is checked with this method.

Javascript

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

// Using the _.isSequential() method
console.log("The Value is Sequential : " +
  _.isSequential( {1:5, 5:10} ));

Output:

The Value is Sequential : false

Example 3: In this example, a string is checked with this method.

Javascript

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

// Using the _.isSequential() method
console.log("The Value is Sequential : " +
  _.isSequential("GeeksforGeeks"));

Output:

The Value is Sequential : false