--- title: "AngularJS Expressions and Modules" description: "AngularJS Expressions are code snippets usually placed in bindings within the HTML template to bind data to the view." author: "Ravi Vishwakarma" published: 2024-06-24 updated: 2024-06-24 canonical: https://www.mindstick.com/blog/304413/angularjs-expressions-and-modules category: "angular js" tags: ["web development", "angular js", "front-end development"] reading_time: 3 minutes --- # AngularJS Expressions and Modules **AngularJS [Expressions](https://www.mindstick.com/forum/33876/what-is-the-syntax-for-lambda-expressions-in-vb-dot-net)** are code snippets usually placed in bindings within the HTML template to [bind data](https://www.mindstick.com/forum/415/how-to-bind-data-in-windows-phone-7-using-wcf-service) to the view. They can be written inside double [curly braces](https://answers.mindstick.com/qa/31876/when-we-use-curly-braces-in-the-string-format-its-not-working-in-c-sharp) `{{ expression }}` or directly in directives. **Basic Syntax**: **Interpolation**: `{{ expression }}` **Example:** `

` would display `10`. **Directives**: **ng-bind**: Another way to bind data. **Example:** `

` **Expressions vs [JavaScript](https://www.mindstick.com/articles/874/how-to-create-watermark-text-for-textbox-by-using-javascript)**: - AngularJS expressions are like JavaScript expressions, but they are safe to use in HTML. - They do not support [control flow](https://www.mindstick.com/interview/33772/what-is-the-control-flow-function-and-its-execution-in-control-flow-statements) statements like `if`, `for`, etc. - They can include **literals**, **operators**, and **variables**. **Examples**: - Mathematical operations: `{{ 1 + 1 }}` - String [concatenation](https://www.mindstick.com/forum/34153/how-to-write-program-to-file-concatenation-program-in-java-i-o): `{{ "Hello " + name }}` - Function calls: `{{ myFunction() }}` - Object access: `{{ user.name }}` ### AngularJS Modules **AngularJS Modules** are containers for different parts of an [application](https://www.mindstick.com/articles/12824/calculator-application-in-android). They help in separating the application into reusable parts and in [organizing code](https://www.mindstick.com/forum/158791/what-are-rust-s-modules-and-how-are-they-used-for-organizing-code). **Creating a Module**: Use `angular.module` to create a new module. **Example:** `var app = angular.module('myApp', []);` **Adding Dependencies**: You can specify dependencies on other modules. **Example:** `var app = angular.module('myApp', ['ngRoute', 'ngResource']);` **Components of a Module**: - **[Controllers](https://www.mindstick.com/forum/155773/how-asynchronous-controllers-work-in-asp-dot-net-mvc)**: Define the behavior of a particular scope. ```javascript app.controller('myCtrl', function($scope) { $scope.greeting = 'Hello, World!'; }); ``` - **Services**: [Share data](https://www.mindstick.com/forum/160500/how-can-you-share-data-between-servlets) and behavior across the application. ```javascript app.service('myService', function() { this.sayHello = function() { return 'Hello!'; }; }); ``` - **Directives**: Teach HTML new tricks by extending its functionality. ```javascript app.directive('myDirective', function() { return { template: 'This is a custom directive' }; }); ``` - **Filters**: Format data displayed to the user. ```javascript app.filter('capitalize', function() { return function(input) { return input.charAt(0).toUpperCase() + input.slice(1); }; }); ``` - **Factories**: Similar to services but can return any value. ```javascript app.factory('myFactory', function() { return { greet: function() { return 'Hello, World!'; } }; }); ``` ## Example of AngularJS Application ```javascript

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