Immediately return a resolved promise using AngularJS

Question

I\'m trying to get my head around promises in JavaScript (in particular AngularJS).

I have a function in a service, let\'s call it fooService, that chec

Answer 1

The current accepted answer is overly complicated, and abuses the deferred anti pattern. Here is a simpler approach:

this.update = function(data_loaded) {
    if (data_loaded) return $q.when(data);  // We've loaded the data, no need to update

    return Restangular.all('someBase').customGet('foo/bar')
                             .then(function(data) {
        // Do something with the data here 
    });
};

Or, even further:

this._updatep = null;
this.update = function(data_loaded) { // cached
    this._updatep = this._updatep || Restangular.all('someBase') // process in
                                                .customGet('foo/bar'); //.then(..
    return this._updatep;
};