Lodash _.second() Method

The Lodash _.second() method takes an array and an index and hence returns an array generated by taking elements from the original array starting with the second element and ending at the given index.

Syntax:

_.second(array, index);

Parameters: This method takes two parameters as mentioned above and described below:

• array: The given array from the elements are to be taken.
• index: The index up to which elements are to be taken.

Return Value: This method returns a generated array.

Note: This will not work in normal JavaScript because it requires the lodash contrib library to be installed. 

Module Installation: Lodash contrib library can be installed using the following command:

npm install lodash-contrib –save

Example 1: 

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

// Array
var array = [1, 2, -1, -1, 5, 6, -6, -6, -7, -8, 9, 9, 10];

// Creating array
var arr = _.second(array, 4);
console.log("Original Array : ", array);
console.log("Generated Array: ", arr);

Output:

Original Array :  [
   1,  2, -1, -1, 5, 6,
  -6, -6, -7, -8, 9, 9,
  10
]
Generated Array:  [ 2, -1, -1 ]

Example 2: If no index is passed, this method returns the second element from the original array.

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

// Array
var array = [1, 2, -1, -1, 5, 6, -6, -6, -7, -8, 9, 9, 10];

// Creating array
var arr = _.second(array);

console.log("Original Array : ", array);
console.log("Element: ", arr);

Output: 

Original Array :  [
   1,  2, -1, -1, 5, 6,
  -6, -6, -7, -8, 9, 9,
  10
]
Element:  2

Example 3: If the index passed is negative, the array is created up to the element on that index from right. 

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

// Array
var array = [1, 2, -1, -1, 5, 6, -6, -6, -7, -8, 9, 9, 10];

// Creating array
var arr = _.second(array, -2);

console.log("Original Array : ", array);
console.log("Generated Array: ", arr);

Output: 

Original Array :  [
   1,  2, -1, -1, 5, 6,
  -6, -6, -7, -8, 9, 9,
  10
]
Generated Array:  [
   2, -1, -1,  5, 6,
  -6, -6, -7, -8, 9
]

Example 4: If the index is out of bounds, the remaining full array is created after the second element.

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

// Array
var array = [1, 2, -1, -1, 5, 6, -6, -6, -7, -8, 9, 9, 10];

// Creating array
var arr = _.second(array, 100);

console.log("Original Array : ", array);
console.log("Generated Array: ", arr);

Output: 

Original Array :  [
   1,  2, -1, -1, 5, 6,
  -6, -6, -7, -8, 9, 9,
  10
]
Generated Array:  [
   2, -1, -1,  5, 6,
  -6, -6, -7, -8, 9,
   9, 10
]