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

title, tags, expertise, cover, firstSeen, lastUpdated

title	tags	expertise	cover	firstSeen	lastUpdated
Nth argument	function	beginner	blog_images/mug-flower-book.jpg	2018-01-23T21:27:37+02:00	2020-10-21T21:54:53+03:00

Creates a function that gets the argument at index n.

• Use Array.prototype.slice() to get the desired argument at index n.
• If n is negative, the nth argument from the end is returned.

const nthArg = n => (...args) => args.slice(n)[0];

const third = nthArg(2);
third(1, 2, 3); // 3
third(1, 2); // undefined
const last = nthArg(-1);
last(1, 2, 3, 4, 5); // 5