[angularjs] AngularJS : When to use service instead of factory

Can use both the way you want : whether create object or just to access functions from both

You can create new object from service

app.service('carservice', function() {
    this.model = function(){
        this.name = Math.random(22222);
        this.price = 1000;
        this.colour = 'green';
        this.manufacturer = 'bmw';
    }
});

.controller('carcontroller', function ($scope,carservice) { 
    $scope = new carservice.model();
})

Note :

• service by default returns object and not constructor function .
• So that's why constructor function is set to this.model property.
• Due to this service will return object,but but but inside that object will be constructor function which will be use to create new object;

You can create new object from factory

app.factory('carfactory', function() {
    var model = function(){
        this.name = Math.random(22222);
        this.price = 1000;
        this.colour = 'green';
        this.manufacturer = 'bmw';
    }
    return model;
});

.controller('carcontroller', function ($scope,carfactory) { 
    $scope = new carfactory();
})

Note :

• factory by default returns constructor function and not object .
• So that's why new object can be created with constructor function.

Create service for just accessing simple functions

app.service('carservice', function () {
   this.createCar = function () {
       console.log('createCar');
   };
   this.deleteCar = function () {
       console.log('deleteCar');
   };
});

.controller('MyService', function ($scope,carservice) { 
    carservice.createCar()
})

Create factory for just accessing simple functions

app.factory('carfactory', function () {
    var obj = {} 
        obj.createCar = function () {
            console.log('createCar');
        };
       obj.deleteCar = function () {
       console.log('deleteCar');
    };
});

.controller('MyService', function ($scope,carfactory) { 
    carfactory.createCar()
})

Conclusion :

• you can use both the way you want whether to create new object or just to access simple functions
• There won't be any performance hit , using one over the other
• Both are singleton objects and only one instance is created per app.
• Being only one instance every where their reference is passed.
• In angular documentation factory is called service and also service is called service.