Angular 4 Interview Questions and Answers
Angular 4, released in March 2017, is a JavaScript framework for building apps in HTML, JavaScript, and TypeScript. Angular 4 offers built-in features for HTTP service, animation, and materials. This is an essential topic in the Angular 4 Interview Questions for experienced professionals. The unique feature in Angular 4 is that starting from Angular 4, developers will be able to query ParamMap in the router.
| Quick Facts About Angular 4 | |
|---|---|
| What is current angular version? | Angular 11.0. released on 11th November 2020 |
| Angular4 is Developed by | |
| What language does Angular use? | TypeScript |
| When was Angular first released? | 20th October 2010 |
| When was Angular4 released? | 23rd March 2017 |
| Which is the best free IDE for Angularjs? | Sublime Text, Visual Code, Atoms, etc |
| What is the best Angular version of web development? | For the development, Angular 2 and 4 both are good. |
Most Frequently Asked Angular 4 Interview Questions
The Angular CLI uses a JavaScript module bundler known as Webpack for bundling all code to production.
In Angular 4, a Reducer is a function that specifies how a particular state changes in response to an action/event. The function, without making any itself making any changes to state, returns a new state object with the updates included.
Technically speaking, the Application state is the entire memory of an application built in Angular 4. But as per working terminologies, it represents data received via API calls, user inputs, presentation UI State and basically that data which could be used to differentiate multiple instances within the same application.
In Angular 4, Webpack (open-source JavaScript module banner) is used to bundle JS files, transform, bundle or package any resource or asset within the application. It takes modules having dependencies and generates static resource blocks representing the selected modules.
In order to create block component dynamically, it is important to import following AppComponent such as-
- ViewContainerRef, ComponentFactoryResolver and ViewChild from @angular/core
- MessageComponent from message.component.
- ComponentFactory and ComponentRef from@angular/core
import {
Component,
ViewContainerRef,
ViewChild,
ComponentFactoryResolver,
ComponentRef,
ComponentFactory
}
from '@angular/core';
import { MessageComponent } from './message.component';
@Component(
{
selector: 'app-root',
templateUrl: './app.component.html'
}
)
export class AppComponent {
title = 'app';
}
This means a request for the route- and the query parameter can be assigned to a route. Until Angular 2, route parameters were stored in a key-value object and were accessible through standard JavaScript syntax. Do you want to succeed in your Angular 4 Interview Questions and Answers? Read on!
Another unique feature is that the functions that were necessary for animations are placed in their package. This has been done to avoid creating unnecessary bundles of significant size. Until Angular 2, these functions were offered as part of the core module and were always included even if they were not getting used in apps.
In angular 4, the use of decorators is done extensively for compiling the code. There are four types of decorators – Class, Property, Method, and Parameter.
Type security and speed ngc-Compilerhave improved in Angular 4 as compared to Angular 2. If you are scrolling on the web for angular 4 interview questions and answers pdf, then this guide will gonna help you.