Top 11 Angular interview questions for freshers

Here are the top Angular interview questions for freshers. Let’s get started!

Angular is a widely used language for the development of web and mobile applications. Freshers applying must be able to answer Angular coding questions. Angular interview questions and answers for freshers will check their understanding of architecture, directives, services, and data binding. Angular lifecycle hook interview questions are frequently asked in the technical rounds. Freshers should be prepared to answer questions on TypeScript, CSS, and HTML.

Why were client-side frameworks like Angular introduced?

Previously, web-developers used VanilaJS and jQuery to create dynamic webpages, but as website logic increased it became challenging to manage the code.  They had to work harder to keep the app’s separation of concerns while creating large logic-based applications. Additionally, jQuery did not have tools to handle data across views. 

Client-side framework like Angular helped to address these issues, this made it easier for developers to handle the separation concerns and breakdown the code into smaller units called components.  Developers use client-side frameworks to create complex web applications like Single-Page Applications using client-side framework. You can still use VanillaJS to create SPA but this can slow down the development process significantly. 

Also read : Tips for Acing Your First Job Interview

 What is a TypeScript?

Microsoft built and developed Typescript in 2012 to create large apps. TypeScript is an open-source high-level programming language built on JavaScript. It is a synthetic Superset of JavaScript which adds statistical typing.  It transpiles in JavaScript. Existing JavaScript programs are likewise valid in TypeScript because it is a superset of JavaScript.

What are some of the advantages of Angular over other frameworks?

• Out of the box features – Angular provides a number of built-in features like routing, state management, rxjs library and http servicesstraight out of the box. You do not need to look for the above-stated features separately as they are all provided with Angular.
• Declarative UI – Angular uses HTML to render the UI of an application. HTML is a declarative language and is easier to use than JavaScript.
• Long-term Google support – Google announced long-term support for Angular. The company plans to stick with Angular and expand its ecosystem.

What is data binding? Which type of data binding does Angular use?

Data binding deals with how to bind data from components to HTML DOM elements (Templates). We can effortlessly interact with the application without worrying how to insert your data. It does not need complicated code and features dynamic HTML. We use Data binding use interaction web application like calculators, games, calculator forms, tutorials, and tutorials. Data Binding is practical when pages have a lot of data because of the incremental presentation of the webpage. 

Angular uses two-way binding. Any changes to the UI element is reflected in the appropriate and relevant model states. Conversly you can see any change to model state reflected in the UI element. This guarantees that the framework may use the controller to link the DOM to the Model data.

What is Single Page Application?

Single Page Applications (SPA) are web page applications that load only once and add any new functionality to the user interface. The content of new page is produced dynamically rather than loading a new HTML page. Developers use JavaScript ability to work with the DOM elements on the current page itself. The SPA method offers a seamless user experience because of its quicker. 

Also read: Top 12 Angular advanced interview questions

Explain the lifecycle hooks in Angular?

In Angular, every component has a lifecycle. Angular creates and renders these components and also destroys them before removing them from the DOM. This is achieved with the help of lifecycle hooks. Here’s the list of them:

1. ngOnChanges() – Triggers when Angular sets/resets data-bound input properties.
2. ngOnInit() – Initialize the directive/component after Angular first displays it
3. ngDoCheck() – Detect and act upon changes that Angular can’t or won’t detect on its own.
4. ngAfterContentInit() – Triggers after Angular projects external content into the component’s view
5. ngAfterContentChecked() – Triggers after Angular checks the content projected into the component.
6. ngAfterViewInit() – Triggers after Angular initializes the component’s views
7. ngAfterViewChecked() – Triggers after Angular checks the component’s views
8. ngOnDestroy – Cleanup just before Angular destroys the directive/component.

Differentiate between Angular and AngularJS

What are decorators in Angular?

Decorators are pattern or functions that specify how Angular features operators. They are used to make earlier adjustments to a class, service, or filter. Four different types of decorators are supported by Angular.

• Designers of classes
• Interior Designers
• Decorators of Methods and Parameters

Also read: Top 15 Angular basic interview questions

What are the advantages of Angular over React?

What are templates in Angular?

A template is a kind of HTML that instructs Angular about how to display a component. An Angular HTML template, like conventional HTML, produces a view, or user interface, in the browser, but with far more capabilities. Angular API evaluates an HTML template of a component, creates HTML, and renders it.

There are two ways to create a template in an Angular component:

• Inline Template: The component decorator’s template config is used to specify an inline HTML template for a component. The Template will be wrapped inside the single or double quotes.

Example: 

@Component({

    selector: “app-greet”,

    template: `<div>

        <h1> Hello {{name}} how are you ? </h1>

        <h2> Welcome to interviewbit ! </h2>

    </div>`

})

• Linked Template: A component may include an HTML template in a separate HTML file. As illustrated below, the templateUrl option is used to indicate the path of the HTML template file.

Example: 

@Component({

    selector: “app-greet”,

    templateUrl: “./component.html”

})

What are Annotation in Angular?

Annotation in Angular are used for creating an annotation array. They are the metadata set on the class that is used to reflect the Metadata library.

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