5 Common Angular 7 Interview Questions (With Sample Answers)

Updated 3 February 2023

Angular 7 is an open-source framework used for building applications in Hypertext Markup Language (HTML), JavaScript and TypeScript, a superset of JavaScript. When employers interview Angular 7 developers, they test their knowledge of using various Angular 7 features for application development. By understanding the type of questions employers typically ask during a job interview for an Angular 7 developer position, you can prepare well and increase your chances of getting hired. In this article, we provide a list of commonly asked Angular 7 interview questions and share example answers to help you practise for your upcoming job interview.

Angular 7 Interview Questions With Sample Answers

Here are some commonly asked Angular 7 interview questions and their sample answers:

1. How does Angular 7 differ from AngularJS?

When interviewers ask this question, they want to test your understanding of the two open source frameworks. This is because knowing the differences between Angular JS and Angular 7 can help you select the right one for your application development work. For example, if you want to quickly and easily develop an easy-to-use application, you can use AngularJS. To create more complex and scalable applications, you can choose Angular 7. You can respond to the interview question by listing some of the key differences between the two.

Example: 'AngularJS is the first version of the Angular framework, while Angular 7 is the latest version. Another major difference between them is while AngularJS is HTML and JavaScript based, Angular 7 is Microsoft TypeScript based. AngularJS is not mobile-friendly, while Angular 7 supports mobile applications. AngularJS does not utilise the dependency injection system, while Angular 7 uses a hierarchical dependency injection system. It can become problematic to manage AngularJS projects when they expand and lead to an increase in the source code. The structure and scalability of Angular 7 facilitate the management of larger projects.'

2. What are the key components of Angular 7?

The knowledge of components is crucial for Angular 7 developers, as they often these components for application development. In your answer, you can talk about the components of Angular 7 and their purpose.

Example: 'It is essential to have at least one component in an Angular application for it to run. Most applications generally have a tree structure of components. These components differentiate into categories based on their functionalities. Components are classes that interact with the HTML file and control the HTML view of a browser. They are reusable and make the application scalable and easy to maintain.'

3. What are the differences between components and directives?

Interviewers often ask this question to assess your expertise in Angular 7 for application development. Given the importance of components and directives in the development process, it is necessary for you to know what they are. You can provide brief definitions in your response and explain their uses.

Example: 'Directives are instructions in the document object model (DOM) programming interface for applications that specify the placement of components and business logic in Angular. Components are directives with templates and are useful for creating user interface widgets. While a DOM element may have many directives, it can have only one component. You can use directives to manipulate and alter the DOM elements and design reusable components. The purpose of the component-based model is to divide the application into smaller units that can execute multiple tasks and are easier to manage.'

4. What are the differences between structural and attribute directives in Angular 7?

As understanding the differences between structural and attribute directives is essential for application development, interviewers may test your knowledge with this question. In your response, you can first explain what structural and attribute directives are. You can then list a few of the differences between them.

Example: 'Directives are built-in classes in Angular 7 that are useful for managing the layout, behaviour and appearance of DOM elements. The three types of directives are components, structural directives and attribute directives. There are some differences between structural directives and attribute directives. For example, when writing a structural directive, it is customary to add an asterisk before the attribute selector to indicate the use of a structural directive. Attribute directives are similar to HTML attributes.

You can use a structural directive to remove and add DOM elements for altering the DOM layout, while an attribute directive is helpful for changing the behaviour or appearance of DOM elements. While structural directives can change the entire DOM area, attribute directives only impact the element to which you add them.'

5. What is interpolation in Angular 7?

Interviewers may ask you this question during an Angular 7 job interview to test your knowledge of displaying dynamic data on the user end of HTML templates. You can begin your answer by explaining what data binding is in Angular 7. You can then discuss one-way data binding, which is also known as interpolation in Angular 7.

Example: 'For learning about interpolation in Angular 7, it is first necessary to learn about data binding. It is an Angular 7 feature that facilitates communication between the component and its view. The two types of data binding are one-way data binding and two-way data binding. One-way data binding includes string or angular interpolation, event linking and linking properties. In these, you insert the model value into the HTML element. You cannot update the model from the view. Two-way binding has automatic data synchronisation so that changes in the model value appear in the view and vice versa.

In one-way data binding, interpolation is a technique that you can use to bind the model value to the HTML element in the user interface. As you bind the data in one way with interpolation, any changes you make to the bound field value get reflected in the HTML page and you cannot change the field value. For data context for its template, the HTML component template uses a component class object. Because of this, when you want to bind the value in the view, it is essential that you assign it to the component class field.'

Tips To Prepare For Your Angular 7 Interview

Besides preparing answers to common Angular 7 interview questions, you may consider the following tips to increase your chances of success at your next interview:

Research the company and the Angular 7 role

You can research the company and the type of applications it produces by reading the content on its website and social media platforms. To get informed about its industry standing, check any mentions of it in industry publications, news stories, professional forums and search engine results. You can also look up the company's Angular 7 developers on social media and professional networks to better understand the type of work you might do if you get hired. Being well-informed about the role can improve your confidence and enable you to prepare yourself better for the interview.

Improve your technical knowledge of Angular 7

To prepare for the Angular 7 job interview, you can read about the Angular 7 architecture units like modules, components, templates, metadata, data binding, directive, services and dependency injection. Review your knowledge of HTML, Cascading Style Sheets (CSS), TypeScript and Angular 2. Get informed about unique Angular 7 features like command-line interface (CLI) prompts, application performance, virtual scrolling, drag and drop and bundle budget.

Be prepared to answer questions about the benefits of Angular 7 for application and web development. For example, you might mention the Google-supported community, the modular structure of Angular 7, its code consistency, the declarative user interface and the use of TypeScript and JavaScript objects.

Build Angular 7 work experience

Employers may base their hiring decision on your practical knowledge of Angular 7 software engineering and experience in designing and developing responsive user interfaces and interactive web applications. Aside from presenting professional projects, you can include personal projects that show your coding skills. You can build work experience by accepting freelance work, working on open source Angular 7 projects and undertaking volunteer work to make yourself more employable.

Practice mock interviews

You can work on improving your level of articulateness and confidence with mock interviews featuring the most frequently asked questions. Ask a family member, friend or colleague to conduct them for you and provide with honest feedback about your performance. It is also a good idea to video record yourself to help you review the overall performance. You can then identify the areas where you require improvement and focus on those accordingly to create a positive impression in the interview.

Please note that none of the companies, organisations or institutions mentioned in this article are associated with Indeed.