30-seconds-of-code/snippets/last.md

title, tags

title	tags
last	array,beginner

Returns the last element in an array.

Check if arr is an instance of an Array, use arr.length - 1 to compute the index of the last element of the given array and return it, otherwise return undefined.

const last = arr => (arr instanceof Array ? arr[arr.length - 1] : undefined);

last([1, 2, 3]); // 3
last([]); // undefined
last(null); // undefined
last(undefined); // undefined