$.cachedGetScript Using jQuery Deferreds.

readme.md

@Julian, In respect to a $.cachedGetScript utility:

I'm trying to understand the differences between using a variable stored cache (your example - cachedGetScript.js) and jQuery's Ajax Cache (cachedGetScript2.js)? Is there a difference at all?

E.

cachedGetScript.js

// http://msdn.microsoft.com/en-us/magazine/gg723713.aspx

var store.cachedScriptPromises = {};

$.cachedGetScript = function(url, callback) {
	if (!store.cachedScriptPromises[url]) {
		store.cachedScriptPromises[url] = $.Deferred(function(d) {
			$.getScript(url).then(d.resolve, d.reject);
		}).promise();
	}

	return store.cachedScriptPromises[url].done(callback);
};

cachedGetScript2.js

$.cachedGetScript2 = function(url, callback){
	callback = $.isFunction(callback) ? callback : {};
	
	// Use $.ajax() since it is more flexible than $.getScript
	// Return the jqXHR object so we can chain callbacks
	return $.ajax({
		type: "GET",
		url: url,
		dataType: "script",
		cache: true
	}).done(callback);
};