Angular Interview Questions and answer

Angular Interview Questions and answers

Here we will discuss Angular Interview Questions and answers. I’m going to present some of the most significant Angular Interview Questions and Answers that will set you apart in the interview process in 2021 in this Angular Interview Questions article. Angular is renowned as the Swiss army knife of frontend developers, with over 7.2 million repositories on GitHub! This is why Angular Certification is the most sought-after certification in the scripting industry.

Google developed and maintains Angular Interview Questions and answers. one of the most popular JavaScript frameworks. It’s a TypeScript-based open-source front-end web framework. Because its code is reusable and maintainable. It is best suited for designing enterprise web applications.

1. Why were client-side frameworks like Angular introduced?

Web developers utilised VanillaJS and jQuery to create dynamic websites back in the day, but as the logic of a website developed, the code became increasingly difficult to maintain. Developers had to put in extra effort to keep the app’s separation of concerns for applications that used complicated logic. Furthermore, jQuery lacked the ability to handle data across many views.

Client-side frameworks such as Angular came into being to address the aforementioned issues, making life easier for developers by handling separation of responsibilities and splitting code into smaller chunks of information (In the case of Angular, called Components).

Client-side frameworks enable complex web apps such as Single-Page-Application to be created. 

2. What is Angular?

Angular is a front-end web framework that is open-source. It’s one of the most well-known JavaScript frameworks, and it’s mostly maintained by Google. It provides a framework for easy web-based application creation and empowers front-end developers to curate cross-platform apps. It has powerful features such as declarative templates, end-to-end tooling, dependency injection, and other best practises that make the development process go more smoothly.

3) What is the main purpose of Angular?

The core goal of Angular is to construct online applications that are fast, dynamic, and scalable. With Angular, we can simply develop these applications using components and directives.

Angular began out as an SPA (Single-Page-Application) framework, but now it uses dependency injection to support dynamic content based on various users. It provides a framework for easy web-based application creation and empowers front-end developers to curate cross-platform apps. The most well-known Angular application is YouTubeTV.

4. What is Angular mainly used for?

Angular is commonly used in the building of Single Page Applications, or SPAs. It comes with a set of ready-to-use modules that make developing single-page applications a breeze. Angular is also recognised as a full-fledged web framework. With capabilities such as built-in data streaming, type safety, and a modular CLI.

5. What are Angular expressions?

Angular expressions are code snippets similar to JavaScript that are frequently placed in bindings such as expression. These expressions are used to connect HTML to application data.

6. What are templates in Angular?

Angular templates are created in HTML with Angular-specific components and properties. These templates are paired with data from the model and controller. Which is then rendered to present the user with a dynamic view.

7. In Angular what is string interpolation?

In Angular, string interpolation is a specific syntax for presenting component data that uses template expressions within double curly brackets. Moustache syntax is another name for it. The curly braces contain the JavaScript expressions. Which are then run by Angular, and the relative output is then integrated into the HTML code. As part of the digest cycle. These expressions are usually updated and registered like watches.

8. What is the difference between an Annotation and a Decorator in Angular?

In Angular, annotations are the “sole” collection of metadata for a class that uses the Reflect Metadata library. They’re used to make an array called “annotation.” Decorators, on the other hand, are design patterns that are used to separate the decoration or change of a class from the original source code.

9. In Angular, what do you mean by controllers?

Controllers are JavaScript functions that give HTML UI data and logic. They regulate how data flows from the server to the HTML UI, as the name implies.

10. What is the scope of Angular?

The scope object in Angular refers to the application model. It’s an expression execution context. Scopes are organised in a hierarchical format that mirrors the application’s DOM structure. Expressions can be monitored and events can be propagated via scopes.

11. What are Angular directives?

Directives are attributes that allow you to construct new HTML syntax that is specific to your application. They are a major element of Angular. They’re basically routines that the Angular compiler runs when they’re found in the DOM. 

12. What is data binding, and how does it work?

Data binding is one of the most powerful and crucial aspects of Angular, allowing you to define how the component communicates with the DOM (Document Object Model). It essentially simplifies the process of creating interactive apps by removing the need to worry about data being pushed and pulled between your view or template and component.

13. What are Angular’s decorators?

Decorators are a design pattern that allows you to edit or decorate a class without having to change the source code. Decorators are functions in AngularJS that allow you to modify a service, directive, or filter before using it.

14. What is the difference between eager and lazy loading?

Before the programme starts, the application module, AppModule, is eagerly loaded. Feature modules, on the other hand. Contain all of the features of each module and can be loaded in two ways: eagerly or slowly, or even preloaded in some circumstances.

15. Describe Angular’s components, modules, and services.

Decorators are used by modules, components, and services. These decorators indicate the type of element they are and offer metadata that tells Angular how to use them. A component class’s metadata ties it with a template that defines a view.

Components: Every Angular App has one or more components at its core. In reality, we build intricate programmes with dozens of components in the real world. A Component contains all of the data, HTML content, and logic for a view underneath the view. Angular supports component-based design, which allows us to work on smaller, more maintainable chunks that can also be reused in different places.

At least one component is required in every application.The appcomponent is also known as the root component. Starting with the appcomponent, which is a real-world component, An Angular application is essentially a collection of components.


A module is a container for a group of interconnected components. At least one module, referred to as the app module, is present in every angular app. As our application grows, we may wish to break down our modules into smaller, more manageable chunks. As the programme grows, we’ll need to break down our app module into smaller pieces, each of which will be in charge of a separate component. It has interconnected components.


Angular services are singleton objects that are created only once during the lifetime of an application. They include methods for maintaining data during the life of an application, i.e., data that isn’t refreshed and is constantly accessible.

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