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if (Check.versionOf("foo.js") == Check.NOT_LOADED) {
	// foo.js is not loaded
}
 
// this might causewill attempt to load foo.js toif not bealready autoloadedloaded...
if (Check.has("foo.js") == Check.NOT_LOADED) {
	// tried to load foo.js but did not succeed
} else {
	// foo.js autoloaded or was already loaded
}
 
// this will prevent not attempt to autoload foo.js from being autoloaded...
if (Check.has("foo.js", Check.NOT_LOADED)) {
	// foo.js is not loaded
} else {
	// foo.js was already loaded
}

var dependencies = {
	"bar.js": Check.ANY_VERSION,
	"foo.js": Check.NOT_LOADED
};
 
// the task will only run if bar.js is loaded and foo.js is *not* loaded
Check.doWhen(dependencies, self, task);
 
// will throw an error if bar.js is not loaded or foo.js is loaded
Check.required(dependencies, self);