Exploring the various methods of creating controllers and services in AngularJS and understanding the rationale behind each approach

Question

Exploring the various methods of creating controllers and services in AngularJS and understanding the rationale behind each approach

I've been observing various instances of controller and service creation in AngularJS and I'm feeling perplexed. Could someone elucidate the distinctions between these two methods?

app.service('reverseService', function() {
    this.reverse = function(name) {
        return name.split("").reverse().join("");
    };
});

app.factory('reverseService', function() {
    return {
        reverse : function(name) {
            return name.split("").reverse().join("");
        }
    }
});

Here's an example of a controller:

function ExampleCtrl($scope) {
    $scope.data = "some data";
}

app.controller("ExampleCtrl", function($scope) {
    $scope.data = "some data";
}

javascript angularjs

Answer 1

Answer №1

To prevent polluting the global namespace, it is important to scope the Controller to a specific module instance.

function ExampleCtrl($scope){
    $scope.data = "some data";
}

This can be achieved by using the array notation when defining the controller, as shown below:

app.controller("ExampleCtrl", ['$scope', function($scope){
    $scope.data = "some data";
}]);

The subtle difference between an angular service and factory lies in how they are initialized - a service wraps a factory which uses $injector.instantiate for initialization.

Answer 2

To prevent polluting the global namespace, it is important to scope the Controller to a specific module instance.

function ExampleCtrl($scope){
    $scope.data = "some data";
}

This can be achieved by using the array notation when defining the controller, as shown below:

app.controller("ExampleCtrl", ['$scope', function($scope){
    $scope.data = "some data";
}]);

The subtle difference between an angular service and factory lies in how they are initialized - a service wraps a factory which uses $injector.instantiate for initialization.

Answer 3

Answer №2

When it comes to creating controllers and directives, my preferred method is as follows:

/**
* CustomController.controller.js
*/

(function(){
'use strict';

    angular.module('app.modules.CustomModule').controller('CustomController', CustomController);

    CustomController.$inject =
        [
            '$scope',
            '$http',
            '$log',
        ];

    function CustomController($scope, $http, $log) {
        /* controller logic goes here */
    }
})();

Note: The use of an Immediately Invoked Function Expression (IIFE) prevents global namespace pollution in the code snippet above.

Answer 4

When it comes to creating controllers and directives, my preferred method is as follows:

/**
* CustomController.controller.js
*/

(function(){
'use strict';

    angular.module('app.modules.CustomModule').controller('CustomController', CustomController);

    CustomController.$inject =
        [
            '$scope',
            '$http',
            '$log',
        ];

    function CustomController($scope, $http, $log) {
        /* controller logic goes here */
    }
})();

Note: The use of an Immediately Invoked Function Expression (IIFE) prevents global namespace pollution in the code snippet above.

Exploring the various methods of creating controllers and services in AngularJS and understanding the rationale behind each approach

Answer №1

Answer №2

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