What are the benefits of using .factory instead of declaring a variable in AngularJS?

As I delve into learning Javascript and Angular JS, I'm exploring alternative approaches to using .factory. Instead of declaring what it returns as a variable and referencing it, I'm curious if there's a way around using factory.

Why is factory necessary instead of just defining what it returns as a function? Is there a workaround available?

JAVASCRIPT CODE 1 (MY CODE): http://jsfiddle.net/chrisguzman/s4dBE/4/

  myapp.controller("SampleController",
    function SampleController($scope,$firebase){
        var ref = new Firebase("https://helloworldtest.firebaseio.com/text");
        var service = $firebase(ref);
        service.$bind($scope, "text");
    })

JAVASCRIPT CODE 2 (ORIGINAL CODE): http://jsfiddle.net/chrisguzman/s4dBE/3/

angular.module("sampleApp", ["firebase"])
  .factory("sampleService", ["$firebase", function($firebase) {
    var ref = new Firebase("https://helloworldtest.firebaseio.com/text");
    return $firebase(ref);
  }])
  .controller("SampleController", ["$scope", "sampleService",
    function($scope, service) {
      service.$bind($scope, "text");
    }
  ]);

Bonus query: Can the second code snippet be written differently without using factory to gain a deeper understanding? It would be enlightening to accomplish the same task without relying on factory, possibly by utilizing a function as the controller's second argument (as that's where most exposure lies).

Answer №1

The factory serves as a centralized data source for easy injection into multiple controllers, eliminating the need to duplicate Firebase code in each controller. This becomes especially beneficial as your application expands and managing duplicate code becomes cumbersome.

An example of how to use a factory:

var app = angular.module('firebaseApp',['firebase']);

app.factory('FBService',function($firebase) {
    var firebase_url = "https://helloworldtest.firebaseio.com/";

    return {
        ref: function(ref_path) {
            var new_ref = new Firebase(firebase_url + '/' + ref_path + '/');
            return $firebase(new_ref);
        }
    }
});

app.controller('List1Ctrl',function($scope,FBService) {
    $scope.list1 = FBService.ref('list1');
});

app.controller('List2Ctrl',function($scope,FBService) {
    $scope.list2 = FBService.ref('list2');
});

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