Javascript Framework Interview Questions

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Michael Zippo 04.11.2021

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If you’re into web development, you’ve probably heard of Angular. This framework is currently a hot topic: Forbes, Indiegogo, and Delta Airlines all use Angular for their sites. Today, there are many career opportunities in web applications that require a good working knowledge of Angular.

As a result, you may run into questions during the interview to make sure you have the Angular Intelligence you say you have. We’ve put together a list of Angular Interview FAQs to help you hone your understanding of Angular and improve your next interview.

What is Angular ?

Angular is an open source TypeScript framework and is a complete rewrite of AngularJS (a JavaScript framework). A framework is a skeleton on which to rely; it’s almost a full web page that requires a bit of setup and customization to make it work. It works other than a JavaScript library , which is just a set of features.

Angular is also the A in the widely used MEAN stack, which includes MongoDB, Express.js, Angular application, and Node.js.

Angular interview questions

Q: Which architecture uses Angular ?

A: Angular uses the Model View Controller (MVC) architecture.

Q: What does each aspect of MVC represent in Angular ?

A: In Angular:

1. The model, the main data structure, is Angular itself.
2. The view is what is displayed on the client side, written in HTML.
3. The controller is the logic that responds to input and executes the model, written in JavaScript.

Q: What is dependency injection ?

A: Dependency injection is a design method Angular uses to determine how properly components are dependent to use.

Q: What is two-way data binding ?

A: Two-way data binding indicates that the model and view influence each other, as opposed to one-way binding where the model affects the view and not the other way around.

D: What is ng-content ?

A: The ng-content directive is used for content projection, where a value can be supplied later to corner. It is very useful for creating reusable components.

Q: What are Angular services ?

A: Angular services are singleton objects that remain active for the duration of the program. They typically provide logic or controller services and can be called from any component.

Q: How is application data related to HTML ?

A: You do this with Angular expressions, which are snippets of code in an association with double braces.

D: What is string interpolation ?

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A: String interpolation is a single syntax that uses double braces. The code inside is executed by Angular and the output is displayed as HTML. This is also called the mustache syntax.

Q: How are promises and observables different ?

A: Observables handle a flow of events and are not executed unless a subscription is made. The promises organize a single event on site.

Q: What is a supplier ?

A: A provider is a special service that can be configured. It provides a way for the dependency injection system to find the required values.

D: What is an annotation ?

A: The annotations come from Traceur and create an "annotation" table . A: Decorators come from TypeScript and are functions that get a decorated object and make changes to it.

Q: What are Angular directives ?

A: Directives are used for DOM manipulation. They can be used to bind behaviors or transform DOM elements. Angular directives start with " ng- " and some of the most popular are listed here:

• Ng-controller, which connects the controller to the view.
• Ng-content, which is used for content projection.
• Ng-model, a directive used for two-way data binding.
• Ng-bind, which binds the properties of the model and the results of ng-model.
• Ng-app, which initializes Angular