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

title, tags, firstSeen, lastUpdated

title	tags	firstSeen	lastUpdated
collectInto	function,array,intermediate	2017-12-22T05:08:36+02:00	2021-06-13T13:50:25+03:00

Changes a function that accepts an array into a variadic function.

• Given a function, return a closure that collects all inputs into an array-accepting function.

const collectInto = fn => (...args) => fn(args);

const Pall = collectInto(Promise.all.bind(Promise));
let p1 = Promise.resolve(1);
let p2 = Promise.resolve(2);
let p3 = new Promise(resolve => setTimeout(resolve, 2000, 3));
Pall(p1, p2, p3).then(console.log); // [1, 2, 3] (after about 2 seconds)