Top Angular 2 Interview Questions and Answers

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In some cases, we need to extend the existing type by providing some more properties to it or if we need to define additional types to avoid Typescript warning. Out of both the functions the link function is used very often. What is Angular 2 Outputs?

If you know Angular 2, you can easily switch to Angular 4. Internationalization is a way in which you can show locale specific information on a website. If we change the value in Textbox then it will update the model or if we change the value of model then it will immediately update the View.

Top 25+ Angular 2 Interview Questions & Answers

Angular 4 interview questionsThese Angular 4 questions have been designed for various interviews, competitive exams and entrance tests. We have covered questions on both basic and advanced concepts which will help you improve your skills to face interview questions on Angular 4. Who is this Angular 4 interview questions designed for. Angular 2There is no path breaking difference between angular 2 and angular 4. Angular 4 is simply the next version of Angular 2. The underlying concepts are same. If you know Angular 2, you can easily switch to Angular 4. Angular 4 is backward compatible with Angular 2 for most Applications. Migrating to Angular 4 may reduce production bundle. Angular 4 is faster than Angular 2. The apps developed in Angular 4 are five times faster and smaller as compared to Angular 2. Before Angular 4, only TypeScript 1. So with Angular 4, we have all new features of Typescript available. If you don't use animations, this extra code will not angular 2 interview questions up in the production bundle. Angular 4 has introduced a new titlecase pipe. Router ParamMap Starting from version 4, it is possible to use paramMap to get the route- and query-parameter from a related route. The use of Map brings advantages in terms of type security. The new way provides either a string, or an array of strings related to the used method paramMap. This avoids creating bundles with unnecessary large sizes. NgComponentOutlet To build and produce components dynamically at runtime involved relatively much programming angular 2 interview questions. Angular Universal With Angular Universal, it is possible to render Angular applications on the web server. With that, websites can be optimized better for search engines as JavaScript is no longer necessary for initially rendering the page content. What is the use of Interceptors. It can be really useful for features like caching and logging. Interceptors can be used on multiple scenarios, i. Why do we need Angular. We can develop application using Javascript and Jquery. But as the application become complex, code in Javascript and Jquery become difficult to maintain. We then require to structure the application code properly by incorporating object oriented features. That is why a framework like Angular has been evolved to make web application development and maintenance faster and easier. The application in Javascript is hard to test. Applications build in Angular are easily testable. It is basically a runtime environment for executing Javascript code outside the browser. TypeScript is a superset of Javascript. So any valid Javascript code is also a TypeScript code. Although this feature is optional. Browser don't understand TypeScript code, TypeScript compiles into JavaScript at the time when we build the application. Building blocks of Angular Apps Components - Angular embraces component based architecture which allows us to work with smaller and maintainable piece of code that can be reused at several places. Each Angular App has one or more components. A component controls a patch of screen called a view. Every application has a root component that we call as App component. Modules - It is container for group of related components, i. Every Angular app has at least one NgModule class, the root module, conventionally named AppModule. Templates - You define a component's view with its companion template. Metadata - Metadata tells Angular how to process a class. Example In fact, CourseListComponent really is just a class. It's not a component until you tell Angular about it. To tell Angular that CourseListComponent is a component, attach metadata to the class. In TypeScript, you attach metadata by using a decorator. Here's some metadata for CourseListComponent: Component { selector: 'app-course-list', templateUrl: '. A component is a directive-with-a-template; a Component decorator is actually a Directive decorator extended with template-oriented features. Of course, you can also write your own directives. Components such as HeroListComponent are one kind of custom directive. Services - A service is typically a class with a narrow, well-defined purpose. Components are big consumers of services. Component classes should be lean. They don't fetch data from the server, validate user input, or log directly to the console. They delegate such tasks to services. A component's job is to enable the user experience and nothing more. It mediates between the view rendered by the template and the application logic. Angular factor your application logic into services and make those services available to components through dependency injection. Dependency injection is a way to supply a new instance angular 2 interview questions a class with the fully-formed dependencies it requires. Angular uses dependency injection to angular 2 interview questions new components with the services they need. Steps to follow in order to use component.

Example Attribute Directive activates when a matching attribute is encountered. Within Angular 2 the Form Builder and Control Group are defined. However, from architectural point of view Angularjs 2 is not a new web framework, rather, its just a better framework. This file contains information about Angular 2 project. Each template which is instantiated gets its own scope where the given loop variable is set to the current collection of item. How would you create a component to display error messages throughout your application? The Angular 2 components styling can be 1. How do you differentiate between Angular expressions and JavaScript expressions? How to import css using system import? Introduction To Web Technology Web development has come a long way in delivering functionalities online.