Updated May 15, 2023
Introduction to Angular 6 Questions and Answers
Angular is one of the popular open-source frameworks used for developing front-end-based web applications, supported by the Angular team of Google. Angular has one new version of its implementation, 6.0, with some key new features, especially Angular-CLI.
If you are looking for a job related to Angular 6, you must prepare for the 2023 Angular 6 Interview Questions. Every interview is indeed different as per the various job profiles. Here, we have prepared the important Angular 6 Interview Questions and Answers which will help you get success in your interview.
This 2023 Angular 6 Interview Questions article will present the 10 most important and frequently asked Angular 6 Interview questions. These questions are divided into two parts as follows:
Part 1 – Angular 6 Interview Questions (Basic)
This first part covers basic Angular 6 Interview Questions and Answers.
Q1. Provide clear differences with some good examples of code snippets between “declarations”, “providers”, and “imports” in the ng module for angular 6.
Answer:
Please find below an explanation of the declaration, providers, and imports:
- Declarations: This is one of the key features of Angular for available varieties of components or pipes of a single directive for the current module to other directives of the current module. If someone is willing to use some same declared components in the current module from other directives, then the declaration should be made properly.
- Imports: Helping with the availability of other module components in a current module by importing the same.
- Providers: It is helping DI identify and understand using services and values.
Q2. Explain in detail with a good example of genuine differences identified specifically between “constructor” and “ngoninit” for the angular JS 6 version.
Answer:
This is the basic Angular 6 Interview Question asked in an interview. Please find a detailed explanation below on the constructor and ngonint for angular JS:
- Constructor: Constructor is one of the default declarations for any specific class or object; it can be called every time any class is instantiated, ensuring the initialization of their subclasses and different instance variable fields properly.
- Ngonint: It is one of the first initialized methods used by Angular, mentioned in the first component of an angular life cycle. It mainly indicated that angular had been appropriately completed creating the required details. It is not mandatory to use but best practice to use.
Q3. The application developed in Angular 5 is properly working, and I could not find any issue yet. Then why do we plan to upgrade our application to Angular 6? What are the new features introduced with this new version of Angular JS? Explain in detail.
Answer:
Angular 6 has come with varieties upgradation compared to Angular 5; please find a details explanation below on the same:
- Elements of Angular: One of the key features introduced in Angular 6, is that some of the aspects of Angular can be a wrap and represent one of the web components. The leading utility is the same component can be used efficiently for a non-angular project, as the component can be considered a standard web component.
- New Engine for rendering called Ivy: Helping with application performance, especially in increasing speed and decreasing application.
- New providers called tree shakable: One of the new ways for registering the provider, add inside the @Injectable() using some new attribute name is providedIn.
- RxJS6: One of the updated libraries used by Angular 6.
- ElementRef: ElementRef can define separately in the case of Angular 6, not required to use native element property always.
- Animation: Angular 6 version introduces one new feature called Animation Builder.
- I18n: In Angular 6, we can use i18n at runtime as well; not required to build continuously.
Q4. Explain in detail the reason for using the renderer method in Angular JS, whereas we can easily handle the same by using some native element methods. Was there any facility for using the same? Please explain.
Answer:
When rendering details and fetching data from the platform, Angular assumes the usage of a single platform and browser. Now if angular is going to use some of the native elements of Angular DOMs, then those elements only can be used for the application of the same DOM environment. In angular 6, one new class has come called Render2, which helps in preparing that native element like and web component element so that it can be used anywhere, avoiding DOM dependency.
Q5. Explain in detail about the compiler used by Angular, called AOT (Ahead of time).
Answer:
AOT stands for ahead of time. Angular uses it for precompiling all the angular components and available templates during the build process. AOT always launched in angular-based applications more than others.
Part 2 – Angular 6 Interview Questions (Advanced)
Let us now have a look at the advanced Angular 6 Interview Questions.
Q6. One popular key in Angular is Zone; explain the same in detail.
Answer:
ngZone is nothing but one of the wrappers of the JS file called Zone.js. This key library creates context and ensures proper tracking of various asynchronous functions. Angular is always dependent on zones to detect changes.
Q7. Angular JS developer is sometimes planning to use Lazy loading modules frequently. Explain in detail why it is required and how it impacts directly.
Answer:
Somehow developer needs some feature module load lazily; then they can easily use one of the vital property called loadChildren in the route configuration of Angular JS. Developers generally use it when the application size is increasing daily. So the utility of using the same:
- The application will load an expected module based on its demand.
- And application start will always be faster than usual.
Let us move to the next Angular 6 Interview Questions
Q8. Explain the lifecycle designed for directives and components in Angular JS, especially for the newly introduced version 6.0.
Answer:
Below is the lifecycle normally followed by the components and directives of Angular JS:
- Constructor
- ngOnChanges
- nhOnInit
- ngDoCheck
- ngOnDestroy
- ngAfterContentInit (only for components)
- ngAfterContentChecked (only for components)
- ngAfterViewInit (only for components)
- ngAfterViewChecked (only for components)
Q9. Is it possible to include one embedded view from a defined templateRef already prepared? If yes, please explain the same.
Answer:
This is the most asked Angular 6 Interview Question in an interview. The specific utility of TemplateRef uses the createdEmbeddedView method to attach the embedded view to the DOM.
@Component({
selector: 'app-root',
template: `
<ng-template #template let-name='example'><div>{{…}}</ng-template>
})
export class ApplicationComponent implements AfterViewChecked {
@ViewChild('template1', { read: TemplateRef }) _template: TemplateRef<…>;
constructor() { }
ngAfterViewChecked() {
this.vc.createEmbeddedView(this._template1, {example: '….'});
}
}Q10. Explain in detail if someone is willing to identify the exact route change of Angular then how they can do this.
Answer:
In Angular 6, there has one option called Rx event, which needs to subscribe to a specific instance of Router. Things can be done by below approaches:
class SomeClass{
Constructor(private route : Router){
route.subscribe((val) => ……)
}
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This has been a guide to the list of Angular 6 Interview Questions and Answers. Here we have listed the most useful 10 interview sets of questions so the jobseeker can easily crack the interview. You may also look at the following articles to learn more –
