getScript and leave a trace!

getScript.js

// how jQuery getScript should work!
function getScript (path, callback) {
	if (!getScript.loaded) {
		getScript.loaded = {};
		$('script').each(function () {
			var result = $.Deferred();
			getScript.loaded[$(this).attr('src')] = result.promise();
			result.resolve();
		});
	}
	if (!getScript.loaded[path]) {
		var result = $.Deferred();
		var script = document.createElement("script");
		script.async = "async";
		script.type = "text/javascript";
		script.src = path;
		script.onload = script.onreadystatechange = function(_, isAbort) {
			if (!script.readyState || /loaded|complete/.test(script.readyState)) {
				if (!isAbort) {
					result.reject();
				} else {
					result.resolve();
				}
			}
		};
		script.onerror = function () {
			result.reject();
		};
		$("head")[0].appendChild(script);
		getScript.loaded[path] = result.promise();
	}
	if (callback) {
		getScript.loaded[path].done(callback);
	}
	return getScript.loaded[path];
}

Need to find the author on StackExchange somewhere