Can you explain the purpose of the square brackets within the ".module("modulename", [...])" syntax used in AngularJS?

I recently came across a sample demonstrating routing in AngularJS. I am curious about the connection between the dependency 'ngRoute' and the module mainApp, as shown in the syntax

var mainApp = angular.module("mainApp", ['ngRoute']);
.

In previous examples, I have only seen empty square brackets used in module declaration.

Here is the full code context:

var mainApp = angular.module("mainApp", ['ngRoute']);

  mainApp.config(['$routeProvider',
     function($routeProvider) {
        $routeProvider.
           when('/addStudent', {
              templateUrl: 'addStudent.htm',
              controller: 'AddStudentController'
           }).
           when('/viewStudents', {
              templateUrl: 'viewStudents.htm',
              controller: 'ViewStudentsController'
           }).
           otherwise({
              redirectTo: '/addStudent'
           });
     }]);

Answer №1

When working with Angular, the creation of a module involves passing it an array of the names of other modules it relies on within square brackets.

For instance, in your scenario, the components within the mainApp module are able to utilize directives, services, factories, and values from the ngRoute module since the former depends on the latter for dependency injection. If you wish to create a standalone module that doesn't rely on any others, simply pass an empty array ([]). Check out the Angular documentation for further insights on modules.

Answer №2

[...] represents a collection

In the case of ReactJS.

mainComponent is the main component (main collection) and subComponent is a sub-component (similar to a collection of objects).

An example would be:

var subComponent = [];//{}

var mainComponent = [subComponent];// now the `mainComponent` contains the `subComponent`

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