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Angular Js Interview Questions For Freshers

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Angular Js Interview questions for freshers

Here are 35 important AngularJS interview questions and answers for freshers, covering key concepts and practices:

  1. What is AngularJS?

  • Answer: AngularJS is an open-source JavaScript framework developed by Google to build dynamic web applications. It extends HTML with new attributes and makes it easier to develop single-page applications (SPAs) by providing features like two-way data binding, dependency injection, and directives.

  1. What are the key features of AngularJS?

  • Answer:
    • Two-way data binding: Automatically synchronizes data between the model and view.
    • MVC architecture: Organizes code into Model, View, and Controller.
    • Directives: Extends HTML with new behavior.
    • Dependency Injection (DI): Simplifies code management and testing.
    • Templating: Uses HTML as the template language to display dynamic content.

  1. What is two-way data binding in AngularJS?

  • Answer: Two-way data binding is the synchronization between the model and the view. Any changes made in the model are automatically reflected in the view, and any changes in the view are automatically updated in the model.

  1. What is the difference between ng-model and ng-bind?

  • Answer:
    • ng-model: Binds data for two-way data binding, typically used with input fields (e.g., forms).
    • ng-bind: One-way binding from the model to the view. It automatically refreshes the view whenever the model is updated.

  1. What is the scope in AngularJS?

  • Answer: The $scope object is an execution context for expressions. It acts as a bridge between the controller and the view, storing the model data that is accessible to the view.

  1. What is a controller in AngularJS?

  • Answer: A controller in AngularJS is a JavaScript function that is used to control the flow of data. It is responsible for setting up the model (scope) and providing methods that the view can call to interact with the model.

  1. What are directives in AngularJS?

  • Answer: Directives are markers in the HTML code that tell AngularJS to attach specific behavior to that element or transform the DOM. Common directives include ng-repeat, ng-model, and ng-click.

  1. What is dependency injection (DI) in AngularJS?

  • Answer: Dependency Injection (DI) is a design pattern used in AngularJS to make components independent of each other. It allows Angular to inject services into controllers and other components, reducing the need for explicit instantiation.

  1. What is the difference between a factory and a service in AngularJS?

  • Answer:
    • Factory: A factory is a function that returns an object or a value, and it is more flexible as it can return a different type depending on the logic.
    • Service: A service is a constructor function, and it is instantiated with the new keyword. Services are singletons.

  1. What is the role of $http in AngularJS?

  • Answer: $http is a service in AngularJS used to make HTTP requests (GET, POST, etc.) to the backend server. It simplifies interaction with RESTful APIs.
Angular-Js-Features

  1. What is the $scope object in AngularJS?

  • Answer: The $scope object in AngularJS is used to bind data and functions between the controller and the view. It contains model data and logic, which is accessible to the view.

  1. What is ng-repeat in AngularJS?

  • Answer: ng-repeat is a directive used to repeat a set of HTML elements for each item in an array or object. It is commonly used for displaying lists or tables dynamically.

  1. What is a promise in AngularJS?

  • Answer: A promise in AngularJS is used to handle asynchronous operations. It represents the future value of an operation that is completed asynchronously, allowing you to define success or error callbacks.

  1. What is $watch in AngularJS?

  • Answer: $watch is a function that monitors changes in a model expression and triggers a callback whenever the value of that expression changes. It’s useful for handling updates or side effects.

  1. What is a service in AngularJS?

  • Answer: A service is a reusable function or object used to share data and logic between controllers, directives, or other components. Services are usually defined as singletons.

  1. What is the ng-if directive in AngularJS?

  • Answer: The ng-if directive conditionally includes or removes elements from the DOM based on an expression. If the expression evaluates to true, the element is inserted into the DOM; if false, it is removed.

  1. What is ng-show and ng-hide?

  • Answer:
    • ng-show: Displays an element based on the truthiness of the expression.
    • ng-hide: Hides an element when the expression evaluates to true.

  1. What is ng-class in AngularJS?

  • Answer: The ng-class directive is used to conditionally apply one or more classes to an HTML element based on the expression evaluation.

  1. What is the $location service in AngularJS?

  • Answer: $location is a service that allows access to and manipulation of the browser’s URL. It can be used to read the current URL, change the path, and redirect to different views.

  1. What is a filter in AngularJS?

  • Answer: A filter in AngularJS is used to format or transform data before displaying it in the view. Examples include currency, date, uppercase, and lowercase.
benefits-of-angularjs-development

  1. What is ng-model in AngularJS?

  • Answer: The ng-model directive binds an HTML input element to a model property, providing two-way data binding. It is commonly used in forms for input elements like text boxes and checkboxes.

  1. How do you create a custom directive in AngularJS?

  • Answer: A custom directive is created using the angular.module(‘app’).directive(‘directiveName’, function() {}) syntax. The directive can be used to encapsulate custom behavior and manipulate the DOM.

  1. What is the ng-app directive in AngularJS?

  • Answer: The ng-app directive is used to define the root element of an AngularJS application. It initializes the AngularJS framework and enables other directives to operate.

  1. What is a module in AngularJS?

  • Answer: A module in AngularJS is a container for the different components of an application, such as controllers, services, directives, and filters. Modules help in organizing code and managing dependencies.

  1. What is $rootScope in AngularJS?

  • Answer: $rootScope is a parent object of $scope and is available globally throughout the application. Any property or function added to $rootScope is accessible across controllers.

  1. What is the difference between ng-controller and controllerAs?

  • Answer:
    • ng-controller: Binds the controller’s scope to the view.
    • controllerAs: A more modern approach where the controller is assigned to a property of the scope, offering better encapsulation and avoiding $scope.

  1. What is $timeout in AngularJS?

  • Answer: $timeout is a service in AngularJS that allows you to execute a function after a specified time delay, similar to setTimeout in JavaScript.

  1. What is $compile in AngularJS?

  • Answer: $compile is a service in AngularJS that compiles and links the HTML DOM with the scope. It is used to dynamically create or manipulate elements.
angular js Frameworks

  1. What are angularJS expressions?

  • Answer: AngularJS expressions are JavaScript-like code embedded within HTML. They are used to bind data to HTML elements and are evaluated by AngularJS.

  1. What is the difference between AngularJS and Angular?

  • Answer: AngularJS is a JavaScript-based framework (Angular 1.x), while Angular (2+) is a TypeScript-based, more modern version of the framework. Angular has improved performance, better tools, and a component-based architecture.

  1. What are the lifecycle hooks in AngularJS?

  • Answer: Some common lifecycle hooks in AngularJS are:
    • $onInit: Called when the controller is initialized.
    • $onChanges: Called when data-bound properties change.
    • $doCheck: Called during every change detection cycle.

  1. What is $q in AngularJS?

  • Answer: $q is a service used for handling promises in AngularJS. It provides utility methods for handling asynchronous operations and chaining promise methods.

  1. What are custom services in AngularJS?

  • Answer: Custom services are user-defined functions or objects that provide shared logic across the application. They can handle tasks like API calls, data processing, etc.

  1. What is the role of ng-submit?

  • Answer: The ng-submit directive is used to bind an AngularJS expression to the form submit event. It is typically used for handling form submissions in AngularJS.

  1. What is $routeProvider in AngularJS?

  • Answer: $routeProvider is used to configure the routes in AngularJS. It maps URLs to different views and controllers, enabling single-page application behavior.

These questions and answers should help freshers get a good understanding of the core concepts in AngularJS and be well-prepared for an interview.

Best-AngularJS-Development-Tools

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