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

title, tags, expertise, cover, firstSeen, lastUpdated

title	tags	expertise	cover	firstSeen	lastUpdated
Iterate n times	function	intermediate	blog_images/lake-loop.jpg	2018-01-24T13:50:49+02:00	2020-10-20T11:21:07+03:00

Iterates over a callback n times.

• Use Function.prototype.call() to call fn n times or until it returns false.
• Omit the last argument, context, to use an undefined object (or the global object in non-strict mode).

const times = (n, fn, context = undefined) => {
  let i = 0;
  while (fn.call(context, i) !== false && ++i < n) {}
};

var output = '';
times(5, i => (output += i));
console.log(output); // 01234