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

title, tags, cover, firstSeen, lastUpdated

title	tags	cover	firstSeen	lastUpdated
Function arity	function	trippy-chemicals	2018-01-24T13:59:54+02:00	2020-10-18T20:24:28+03:00

Creates a function that accepts up to n arguments, ignoring any additional arguments.

• Call the provided function, fn, with up to n arguments, using Array.prototype.slice() and the spread operator (...).

const ary = (fn, n) => (...args) => fn(...args.slice(0, n));

const firstTwoMax = ary(Math.max, 2);
[[2, 6, 'a'], [6, 4, 8], [10]].map(x => firstTwoMax(...x)); // [6, 6, 10]