Promise Conveniences

I've found myself making a few Promise helpers over and over, and I was getting tired of it. I made this to reduce the drudgery of it.

Just require it:

require('promise-conveniences');

A looping construct:

console.log(Promise.looper(
	function worker (value) {
		return Promise.resolve(value + 1);
	},
	function checker (nextResult) {
		return nextResult < 10;
	},
	1
));   // 10

If you provide an initial value, it's a while loop, or without one it's a do...until loop.

If the initial value is a Promise, it will wait for the Promise to resolve before starting the loop.

You may return a Promise from the checker, in which case it will wait for the Promise to resolve, and will continue if it resolves with a truthy value, passing the the last worker result to the next invocation.

To wait a specific amount of time:

const then = Date.now();
Promise.waiter(2500)
.then(() => {
	const now = Date.now();
	console.log(`Waited ${now - then} milliseconds`);   // 2504
});