Asynchronous while loop for ES6 Promises.

asyncwhile.js

function asyncWhile(condition, action, ctx) {
	var whilst = function(data) {
		return condition.call(ctx, data) ?
			Promise.resolve(action.call(ctx, data)).then(whilst) :
			data;
	}

	return whilst();
}

Won't that cause stack overflows?

Thank you for this useful piece of code!
IARI, it doesn't cause a stack overflow because the recursion is asynchronous: .then(whilst) is called from the event loop, not from inside whilst() itself.