The _.nth() method takes an array and an index and hence returns the element on that index in that array.
Syntax:
_.nth(array, index);
Parameters:
- array: The given array from the element is taken.
- index: The index on which an element is found.
Return Value: This method returns an element on the given index.
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: In this example, we will get an element from an array using this method.
javascript
// Defining underscore contrib variableconst _ = require('underscore-contrib');// Arraylet array = [-1, -25, -43, 10, 125, -1];// Getting nth elementlet elem = _.nth(array, 2)console.log("Original Array : ", array);console.log("Element: ", elem); |
Output:
Original Array : [ -1, -25, -43, 10, 125, -1 ] Element: -43
Example 2: For out of bonds indexes, this method returns undefined.
javascript
// Defining underscore contrib variableconst _ = require('underscore-contrib');// Arraylet array = [-1, -25, -43, 10, 125, -1];// Getting nth elementlet elem = _.nth(array, 100)console.log("Original Array : ", array);console.log("Element: ", elem); |
Output:
Original Array : [ -1, -25, -43, 10, 125, -1 ] Element: undefined
Example 3: For non-existing negative indexes, this method returns undefined.
javascript
// Defining underscore contrib variableconst _ = require('underscore-contrib');// Arraylet array = [-1, -25, -43, 10, 125, -1];// Getting nth elementlet elem = _.nth(array, -1)console.log("Original Array : ", array);console.log("Element: ", elem); |
Output:
Original Array : [ -1, -25, -43, 10, 125, -1 ] Element: undefined
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