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Lodash _.nth

Overview

The _.nth method is a utility function provided by the popular JavaScript library Lodash. It retrieves the nth element of an array or string.

Syntax:

_.nth(array, [n=0])
  • array (Array | string): The array or string to query.
  • [n=0] (number): The index of the element to retrieve (negative numbers counting from the end). Default is 0.

If the index provided is out of range of the array, undefined is returned.

Example usage:

const arr = ['a', 'b', 'c', 'd'];
_.nth(arr, 1);
// Output: 'b'

const str = 'hello';
_.nth(str, -3);
// Output: 'l'

The _.nth method also works with nested arrays. In this case, the n parameter accepts an array of indices to retrieve nested values. If any of the indices provided are out of range, undefined is returned.

Example usage with nested arrays:

const arr = ['a', ['b', ['c', 'd']], 'e'];
_.nth(arr, [1, 1, 0]);
// Output: 'c'

In the above example, we are retrieving the element 'c' by passing an array of indices [1, 1, 0], where the first index 1 specifies the second element of the outer array, the second index 1 specifies the second element of the inner array at index 1, and the third index 0 specifies the first element of the innermost array at index 1.

Overall, the _.nth method is a useful utility function provided by Lodash that can be used to easily retrieve elements from an array or string, including nested arrays.