Arguments in Angular Controllers

Check out this Angular code snippet from the following page: http://docs.angularjs.org/guide/controller

1 var myApp = angular.module('myApp',[]);
2 
3 myApp.controller('GreetingCtrl', ['$scope', function($scope) {
4     $scope.greeting = 'Hola!';
5 }]);

In line #3 above, what is the purpose of the string '$scope'?

Is it possible to achieve the same result with this approach?

myApp.controller('GreetingCtrl', function($scope) { ... })

What advantages does using an array and mentioning the argument name provide?

Answer №1

The main purpose of the discussion is to ensure that the angular dependency injector can accurately recognize the object for injection even when the code is minified.

For more information, refer to the Minification Note section on the official Angular website.

Answer №2

Absolutely, you can write it as

myApp.controller('GreetingCtrl', function($scope) { ... })
.

Both methods are correct.

The distinction lies in inline annotation of the function, ensuring that your dependencies work smoothly when minifying your script.

When you include $scope as an argument in the function, the angular compiler automatically inserts the scope variable into your controller. It must be specifically $scope and nothing else.

Therefore, if you minify your script and rename variables, the script will not function properly unless you specify the original variable names in array notation (which is how to annotate in AngularJS).

Refer to the official Angular JS documentation for Dependency Injection: Angular JS Dependency Injection

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