In this tutorial, we are going to cover some basic Angular 6 interview questions for beginners with very short description.
Angular 6 Interview questions
Let’s start…
what is Angular 6?
Angular 6 is a javascript based framework for creating large and complex web applications. Angular 6 is a component based framework. Angular 6 provides lots of built-in features like animations, http services, components, and etc. In angular 6, the code is written in typescript and then it compiles to javascript.
What are the Angular 6 advantages over previous angular versions?
There are lots of angular 6 advantages over previous angular version.
- Angular Elements: In previous versions, it was very difficult to create a component that can included in any existing web page. But Angular 6 provides us the great feature to do it with the help of angular elements. Angular 6 is the first angular version, which completely supports the angular elements.
- New Rendering Engine: Angular 6 introduced a new rendering engine called Ivy. In previous versions, angular used a view engine for rendering purposes.
- RxJS 6.0: Now, angular 6 used RxJs 6.0 internally. This improvement helps developer to increase performance.
- Multiple Validators: Angular 6 introduced multiple validators to the formBuilder.array method. In previous versions, there was no way to pass multiple validators.
List down the new features of Angular 6
- Updated Angular CLI: In Angular 6, new commands are added in Angular CLI like ng-update, ng-add.
- Angular Material: In angular 6, angular material is also updated.
- Angular Elements: In previous versions, it was very difficult to create a component that can included in any existing web page. But Angular 6 provides us the great feature to do it with the help of angular elements. Angular 6 is the first angular version, which completely supports the angular elements.
- Template element: Template <template> element is removed from Angular 6 framework. Now, we need to use <ng-template>.
- New Rendering Engine: Angular 6 introduced a new rendering engine called Ivy. In previous versions, angular used a view engine for rendering purposes.
- RxJS 6.0: Now, angular 6 used RxJs 6.0 internally. This improvement helps developer to increase performance.
- Multiple Validators: Angular 6 introduced multiple validators to the formBuilder.array method. In previous versions, there was no way to pass multiple validators.
What are the key components of Angular 6
There are following some key components of Angular 6.
- Components: Components are used to bring the modules together.
- Module: Angular application is divided into logical pieces of code. Each piece of code or module is used to perform single task.
- Service: Services are used to create components which can share across the entire application.
Explain modules in Angular 6
In Angular 6, the module helps us to group the directives, components and services which are related to the application.
Explain components in Angular 6
Components are very important part of Angular 6. Basically, component uses the same architecture as you see in MVC (Model, View, Controller) architecture. Components consist of typescript code, Html code and CSS code.
What is difference between constructor and ngOnInt in Angular 6.
NgOnInit: It is just a method like other methods in a class. It is relies on the binding of the component. It is a component’s life cycle hook which runs first after constructor method when component is being initialized.
Constructor: It is called when the instance of the class is created. It doesn’t rely on the binding of the components. It is a default method of the class.
What is routing in Angular 6?
Routing helps the users to redirect the specific page based on the option they choose.
What is CLI?
Command Line Interface (CLI) provides us commands to create our new application, component, and services and etc.
What is dependency injection?
Dependency Injection is very important concept. It is a design pattern of application. Angular has its own Dependency Injection framework. This framework is used for the design of angular application. It is a coding pattern in which a class adds the functionality from external sources rather than creating them itself.
Explain tsconfig.json file.
This file is used during the compilation. This file has the information that need to be used to run the application.
Explain package.json file.
This file has the information about Angular project.
Explain system.config.ts file.
This file contains all the required system files for angular application. This file loads all the necessary scripts without the need to add a script tag to the html page.
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