Neelesh Sharma
Check out the most important Angular Interview Questions and Answers that you need to learn before going for the interviews.
Advantages of AOT -
1. Faster download: - The Angular 2 app is already compiled so it is faster.
2. Faster Rendering: - If the app is not AOT compiled and the compilation process happens in the browser once the application is fully loaded. This has a wait time for all necessary components to be downloaded and then the time is taken by the compiler to compile the app. With AOT compilation, this is optimized.
3. Lesser HTTP Requests: - It is supporting to the lazy loading. Actually, lazy loading is great concepts for sending an HTTP request to the server. It minimises the multiple requests for each associated HTML and CSS, there is a separate request goes to the server.
4. Detect error at build time: - In Angular 2, the compilation happens beforehand and most of the errors can be detected at the compile-time and this process providing us a better application’s stability.
For more such questions on Angular visit Angular Interview Questions.
In Angular, a module is a mechanism to group components, directives, pipes and services that are related, in such a way that can be combined with other modules to create an application. An Angular application can be thought of as a puzzle where each piece (or each module) is needed to be able to see the full picture.
Pipes were earlier called filters in Angular1 and called pipes in Angular 2 and 4.
The | character is used to transform data. Following is the syntax for the same
{{ Welcome to Angular 4 | lowercase}}
It takes integers, strings, arrays, and date as input separated with | to be converted in the format as required and display the same in the browser.
Originally called AngularJS, Angular is Google’s JavaScript (TypeScript-based) open-source front-end web application framework. It is designed specifically for creating dynamic web applications. With this framework, you can develop front-end based applications without having to use other plug-ins or frameworks. Angular is used to develop state-of-the-art client-side applications, especially Single-Page applications. It has a series of features and tools that simplify the development of the applications themselves while simultaneously guaranteeing excellent performance results.
Some of the popular technologies used to create Angular 8 applications are,
Karma – It is a testing framework for Angular development that provides an environment to test your application on real browsers, phones, and tablets.
Protractor – It is also an end to end test framework that is built on top of WebDriver JS.
Ment.io - It is used to introduce mentions and macros widgets with no dependencies on jQuery.
Angular Kickstart – It speeds up the development process of your AngularJS application.
AngulatFire – It is a flexible API that is used to create backend in your Angular application.
Components are like the basic building block in an Angular application. Components are defined using the @component decorator. A component has a selector, template, style and other properties, using which it specifies the metadata required to process the component.
Angular services are singleton objects that get instantiated only once during the lifetime of an application. They contain methods that maintain data throughout the life of an application, i.e. data does not get refreshed and is available all the time. The main objective of a service is to organize and share business logic, models, or data and functions with different components of an Angular application.
An example of when to use services would be to transfer data from one controller to another custom service.
RxJS is a javascript library that brings the concept of "reactive programming" to the web.
Reactive programming is just a different way of building software applications. Essentially, your software is built to "react" to changes that happen (like click events, data being fetched, etc) instead of the typical way of writing software where we explicitly write code (aka "imperative" programming) to handle those changes.
Routing enables navigation to different views of your application. It is the main way of taking users to different destinations within the web app. From home page to the contact page, for example, you need a route, meaning a path or a way to take you there.The concept is not particular to Angular. You see this approach in most of the MVC frameworks (ASP.Net, Ruby on Rails, Django, Laravel, etc)
