Execute given `func`tion no more often than once every `delay` milliseconds, queue all calls, do not drop anything (unlike throttle and debounce)

rateLimit.js

/*
** Execute given `func`tion no more often than once every `delay` milliseconds, 
** queue all calls, do not drop anything (unlike throttle and debounce)
**
** Example usage:
**   rateLimitedFunc = rateLimit(function (i) { console.log(i) }, 500)
**   for (var i=0; i < 10; i++) rateLimitedFunc(i)
*/
function rateLimit(func, delay) {
	var queue = [], 
		processQueue = function() {
			queue.shift().call();
			if (queue.length) setTimeout(processQueue, delay);
		};

	return function() {
		var args = [].slice.call(arguments), context = this;
		queue.push(function() {
			func.apply(context, args);
		});
		if (queue.length == 1) setTimeout(processQueue, 0);
	}
}