Angularjs - service vs factory vs provider

Angularjs – service vs factory vs provider

There is a main diference:

var module = angular.module('mymodule');
module.service('a', function(){
       this.data = [];
       this.add = function(){};
       this.remove = function(){};
});
module.factory('b', function(){
    function c(p){
          this.data = [];
          this.p = p;
    }

    c.prototype = {
          add : function(){},
          remove : function(){}
    }

    return c;
});
module.factory('c', function(){  
     this.$get = function(){

     }
});

a - is constructor

new a();   

b - is function

b();

c - angular create an instance of function than calls this.$get function

new ProviderFunc().$get();

Factory:
Mostly used to create a new class instance on each controller, below example data property in bb object will not be shared from TestController -> Test2Controller because its new instance.

module.controller('TestController', function($scope, b){
        $scope.bb = new b('you can pass parameter');
});

module.controller('Test2Controller', function($scope,  b){
        $scope.bb = new b('you can pass parameter');
});

Service:
Mostly used to share data over the application. Data array will be visible from TestController to Test2Controller

module.controller('TestController', function($scope, a){
        $scope.bb = a;
});

module.controller('Test2Controller', function($scope, a){
        $scope.bb = a;
});

Provider:
Provider can be configurabile on application instance.

module.config(function(c){
     c.add([
        {
          a:1
         }
     ])
});