The Angular 9 RC is out, what an exciting time to be Angular developer. Ivy is here, Ivy is now the default rendering engine in Angular. Follow along and check latest Angular 9 Interview Questions and Answers with latest Ivy updates for 2021.
What are Observables?
Observables are declarative which provide support for passing messages between publishers and subscribers in your application.
They are mainly used for event handling, asynchronous programming, and handling multiple values. In this case, you define a function for publishing values, but it is not executed until a consumer subscribes to it. The subscribed consumer then receives notifications until the function completes, or until they unsubscribe.
What does this line do?
@HostBinding lets you set properties on the element or component that hosts the directive.
The code applies the css class valid to whatever is using this directive conditionally based on the value of isValid.
Explain the difference between Promise and Observable in Angular?
Having Tech or Coding Interview? Check ? 120 Angular Interview Questions
Explain the difference between Constructor and ngOnInit
Mostly we use ngOnInit for all the initialization/declaration and avoid stuff to work in the constructor. The constructor should only be used to initialize class members but shouldn't do actual "work".
What is Angular Universal?
Angular Universal is a server-side rendering module for Angular applications in various scenarios. This is a community driven project and available under@angular/platform-server package. Recently Angular Universal is integrated with Angular CLI.
What is Redux and how does it relate to an Angular app?
Redux is a way to manage application state and improve maintainability of asynchronicity in your application by providing a single source of truth for the application state, and a unidirectional flow of data change in the application. ngrx/store is one implementation of Redux principles.
Why Incremental DOM has low memory footprint?
Date Added: 2021-05-12
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