Updated March 4, 2023
Introduction To Angular 2 Interview Questions And Answer
Angular 2 JS is a JavaScript framework, it is an open-source framework built over JavaScript. It was built by the developers of Google. Angular 2 framework was used to overcome the obstacles encountered while working with Single Page applications. Also, testing was considered as a key aspect while building the framework. It was ensured that the framework could be easily tested. The first release of the framework was in October 2010. The official site for Angular is https://angular.io/.
To start development with Angular 2, we need to get the following key components installed.
Git: This is the source code software that can be used to get the sample application from the GitHub angular site.
Npm: This is known as the node package manager that is used to work with the open-source repositories. Angular JS as a framework has dependencies on other components. And npm can be used to download these dependencies and attach them to your project.
IDE: There are many editors that can be used for Angular JS development such as Visual Studio Code and WebStorm.
Now, if you are looking for a job that is related to Angular 2 then you need to prepare for the 2023 Angular 2 Interview Questions. It is true that every interview is different as per the different job profiles but still to clear the interview you need to have a good and clear knowledge of Angular 2. Here, we have prepared the important Angular 2 Interview Questions and Answers which will help you get success in your interview.
Below are the 10 important 2023 Angular 2 Interview Questions and Answers that are frequently asked in an interview. These questions are divided into parts are as follows:
Part 1 – Angular 2 Interview Questions (Basic)
This first part covers basic Interview Questions and Answers
1. What is Angular 2, explain in detail?
Answer:
Angular 2 is a framework to build large-scale and high-performance web applications while keeping them easy-to-maintain. Application developed with help of Angular 2 framework is easy to test because of modularization.
Following are the features of Angular 2 framework:
- Services: Services are a set of code that can be shared by different components of an application. So for example, if you had a data component that picked data from a database, you could have it as a shared service that could be used across multiple applications.
- TypeScript: The current version of Angular is based on TypeScript. This is a superset of JavaScript and is maintained by Microsoft.
- Components: The earlier version of Angular had a focus of Controllers but now has changed the focus to having components over controllers. Components help to build the applications into many modules. This helps in better maintaining the application over a period of time.
2. What are the main components of Angular 2?
Answer:
This is the common Angular 2 Interview Questions that is asked in an interview. Angular 2 has the following components: −
- Component: This can be used to bring the modules together.
- Service: This is used to create components that can be shared across the entire application.
- Modules: This is used to break up the application into logical pieces of code. Each piece of code or module is designed to perform a single task.
- Templates: This is used to define the views of an Angular JS application.
- Metadata: This can be used to add more data to an Angular JS class.
3. What is a tsconfig.json file?
Answer:
This file is used to provide the options about Typescript used for the Angular JS project.
{
"compilerOptions": {
"target": "es5",
"module": "commonjstest",
"moduleResolution": "node",
"sourceMap": true,
"emitDecoratorMetadata": true,
"experimentalDecorators": true,
"lib": [ "es2017", "demo" ],
"noImplicitAny": true,
"suppressImplicitAnyIndexErrors": true
}
}4. What is an app.module.ts file?
Answer:
The following code will be present in the app.module.ts file.
The following code will be present in the app.module.ts file.
import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppComponent } from './app.component';
@NgModule({
imports: [ BrowserModule ],
declarations: [ AppComponent ],
bootstrap: [ AppComponent ]
})
export class AppModule { }Explanation of the above line of the code in detail.
The import statement is used to import functionality from the existing modules. First 3 statements are used to import the BrowserModule, NgModule and AppComponent modules into this module.
The NgModule decorator is used to, later on, define the imports, declarations, and bootstrapping options.
The BrowserModule is required by default for any web-based angular application.
The bootstrap option tells Angular which Component to bootstrap in the application.
Let us move to the next Angular 2 Interview Questions
5. How will you convert the input to lowercase and uppercase?
Answer:
a lowercase and uppercase filter is used to convert the input to all lowercase and uppercase.
In below example, we’ve added a lowercase and uppercase filter to an expression using pipe character.
<div>
This Tutorial is {{Demo Tutorial}}
The first Topic is {{appList[0] | lowercase}}
The second Topic is {{appList[1] | uppercase}}
</div>Part 2 –Angular 2 Interview Questions (Advanced)
Let us now have a look at the advanced Interview Questions and Answers.
6. Explain template in Angular 2?
Answer:
Views are defined with help of a template, Angular 2 gives a template to defined the views of a web application.
7. Conversion of string to percentile?
Answer:
Angular 2 provides many filters to perform many tasks; percentile filter is used to do this task.
Let us move to the next Angular 2 Interview Questions
8. Explain the use of Decorators in Angular 2?
Answer:
It is used to identify the classes and type of the object that are created by typescript.
9. What is host decorator in Angular 2?
Answer:
This is the frequently asked Angular 2 interview questions in an interview. It is used to bind the properties of components with UI elements values, these properties defined with @HostBinding inside the component class.
10. Explain the Pipes in Angular 2?
Answer:
It is used in templates to convert the content into the desired output or as per business requirement
Symbol for pipe is like this “|” eg – {{appList[0] | lowercase}}.
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