Introduction
Angular 8 is an open-source JavaScript framework used for Single Page front-end applications. It is a robust technology that is being widely used for app development, increasing the demand for Angular developers. It is one of the most known and used frameworks but quite vast and difficult to navigate. It becomes even more tedious when you lack knowledge on which parts you should familiarize yourself with.
This quick guide on Angular 8 Interview Questions is going to help a lot if you are preparing for an interview regarding the same in the future.
Basic Angular 8 Interview Questions
1. What do you know about Angular 8?
In 2019, the Angular community has released the latest version of Angular, that is, Angular 8. Mainly used to create dynamic web applications, it is the most popular client-side Typescript-based framework. It is very much like other previous versions of Angular with some additional features. You can even upgrade to Angular 8 very easily from its previous versions.
2. Point out some differences between AngularJS and Angular.
Some differences between AngularJS and Angular are mentioned below in the table.
3. Mention some features of Angular 8 which differentiate it from all of its previous versions.
Some prominent features of Angular 8 are-
- New dynamic modules for Lazy Loading.
- Support for web workers.
- New Workspace APIs and Builder available.
- Bazel Support.
- Ivy-rendering engine.
4. What has made Angular so popular in the field of Modern Application Development?
There are many reasons that have made Angular so robust in the field of Modern Application Development. These reasons are-
- Declarative templates
- Dependency injection
- End-to-end tooling
The integration of all these to resolve developers’ development challenges.
5. Tell me something about Bazel.
The known advantages of Bazel are as follows.
- It makes it possible to create both frontends and backends with the same tool.
- Incremental build and test options are available.
- It makes it possible for cache and remote builds to be built on the build farm.
6. Why would anybody use WildCard Router in Angular?
For matching every URL as an instruction to get a clear client-generated view, we use WildCard Router in Angular. The Wildcard Route always performs its tasks at the end and that is why it comes at last. To define the routes of the pages in Angular 8, WildCard Router is mainly used.
7. Is there any way to check the type of value assigned to a given variable in Angular 8?
Yes, we can use ‘typeofchecks’ to check the type of value assigned to a given variable in Angular 8. It is quite similar to what we used in JavaScript.
8. What do you know about Promises in Angular 8?
Promises deal with a single asynchronous event at a time and thus, they provide only a single value. These execute immediately after creation and therefore, cannot be considered lazy.
Promises are not cancellable. They push their errors to the child promises.
9. Share some insights on Observables.
Observables handle a series of asynchronous events for a certain duration. These can be both synchronous and asynchronous and hence, emit multiple values. Since observables are not executed until you subscribe to them, they are considered lazy. These subscriptions can be canceled using the unsubscribe() method. Observables do not deliver errors to subscribers.
10. List key parts of Angular 8 Architecture.
The key parts of Angular Architecture are mentioned below in the list.
11. Explain the concept of Subscribing.
An observable instance will only publish values when someone subscribes to it. The subscribe() method is used to allow subscriptions that will pass an observer object to receive the notifications.
12. What do you mean by Components?
The most basic UI building block of Angular is known as the Component. These components are subsets of directives but unlike directives, components always have a template.
13. Is there anything like ‘NgUpgrade’ in Angular 8?
NgUpgrade is the library present in Angular version 8. This library prominently integrates both AngularJS and Angular components in the application. Basically, this library helps you to bridge the gap between the Dependency Injection Systems of both AngularJS and Angular.
14. Can you explain Event Binding with the help of an example?
To look after the handling of events that are raised from DOM like mouse move, button click, etc., the Event Binding technique is used in Angular 8. Whenever any DOM event occurs, only a specified method is called in the component at that particular moment.
15. Do you have any idea about NgModules?
There is at least one module called AppModule that is present in each and every Angular app. NgModules provide a bootstrap sort of mechanism to launch different applications. A Prominent feature that differentiates NgModules from other JavaScript Modules is its functionality. The functionality is such that it can be exported which can be used by other modules and also, it can import functionalities from other NgModules.
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