Are you a budding angular developer preparing for an interview? Or a recruiter who is wondering what are the basic questions to ask while hiring an angular developer ?. We have got covered for both of you. Here are the top 10 angular interview questions along with their answers.
The following questions are frequently asked questions when hiring an angular developer to test the basic angular knowledge of the candidate. The questions mentioned here are answered to help you understand the core concepts of Angular development. Here is the list of top angular interview questions from the angular experts themselves.
1. Explain data binding in Angular and what are its forms?
Data binding is a method to define the communication between a component and DOM. This makes it easy to define interactive applications without the need of pulling or pushing data. The data binding in Angular allows you to treat the model as a single source. So, whenever any changes occur in a model that will be directly projected in view. There are four forms of data binding depending upon the way of the data flow.
- String Interpolation
- Property Binding
- Event binding
- Two-way data binding
2. What are directives?
Directives are the ideal attributes which are responsible for transforming DOM behaviour while rendering a template. The directives allow you to define the behaviour of the elements in DOM, or simply to define what should happen when a mouse hover or a click. Basically, built-in directives start with ng-prefix. Some of the built-in directives has ngIf, and ngFor. You can also write your own directive to fit your needs.
3. What is the latest version of Angular and how it is different from Angular Js?
4. What is Do Bootstrap (ng Do Bootstrap) In Angular?
Do Bootstrap is a new life-cycle hook for manual bootstrapping of the application instead of using bootstrap array in @NgModule annotation.
5. What are the key components of Angular?
The key components of Angular are Components, Modules, templates, services and metadata.
Components are basic building blocks that control HTML views. Modules are the set of these building blocks like components, directives and many others. Simply put, each logical piece of code is a module. Templates represent the views of the angular application. With Metadata, you can add more data to Angular class.
6. What is Deep Linking in Angular?
Deep linking is a method of making the user to land on a specific page without taking them to the home page. One can easily index their pages in search engines with the help of deep linking in Angular.
7. Explain ng-content, ng-container and ng- template?
The <ng-template> is a template element that Angular uses with structural directives (*ngIf, *ngFor, [ngSwitch] and custom directives).
The <ng-container> is a grouping element. As Angular doesn’t put it in DOM, it does not interfere with styles or layout.
The <ng-content> is used to create configurable components. It can create components that can be configured depending on the needs of its user. Components that are used in published libraries make use of <ng-content> to make themselves configurable.
8. What is Lazy Loading?
9. What are advanced Angular CLI commands?
Some of the best Angular CLI commands that enhances developers’ productivity are
- ng-new – Generate new angular projects
- ng-generate – Generate components using the Angular CLI
- ng-serve – Run your app with just this command
- ng-eject – Pull the ripcord
10. Explain the difference between an Annotation and a Decorator in Angular?
Annotations in Angular are meant to create annotation array. While decorators are design patterns and functions that receive the decorated object. This decorator can also make any changes to the received decorated object without changing the original source code. Moreover, annotations are the only metadata set of the class using the Reflect Metadata library.
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