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

title, tags, cover, firstSeen, lastUpdated

title	tags	cover	firstSeen	lastUpdated
Last array element	array	white-laptop	2017-12-17T17:55:51+02:00	2020-10-20T23:02:01+03:00

Returns the last element in an array.

• Check if arr is truthy and has a length property.
• Use Array.prototype.length to compute the index of the last element of the given array and return it, otherwise return undefined.

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

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