What is the purpose of including a function in an AngularJS dependency array?

When it comes to injecting dependencies, the process involves the following steps:

inject(["$scope", "$compile", function ($scope, $compile) {
  ...
}]);

The syntax used here may seem strange. Placing the function inside the array might appear counter-intuitive. The question arises, why was this specific format chosen? Why not

inject(["$scope", "$compile"], function ($scope, $compile) {

One might prefer the syntax to be:

inject("$scope", "$compile", function ($scope, $compile) {

However, it is understood that this could potentially lead to performance issues. (Removed as it might cause confusion in the question.)

Answer №1

At times, there may be a desire to assign a controller function to a variable, as was the case with ngRoute (an early part of the core Angular framework), rather than registering it using .controller:

$routeProvider
  .when('/Book/:bookId', {
     templateUrl: 'book.html',
     controller: function($scope){
     }
  });

It can also be beneficial to use the same variable for annotation:

$routeProvider
  .when('/Book/:bookId', {
     templateUrl: 'book.html',
     controller: ["$scope", function($scope){
     }]
  });

While it may seem a bit counter-intuitive, it is not entirely unreasonable.

Answer №2

More than just performance:) The reason is due to the minification. You can learn more about it here: Angular Inject minify

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