Angular JS Interview Questions

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Interview is the best part of getting a job in any field and it is one of the most important part of the selection process. Before the interview you should be prepared for the interview questions, because you can get the job or not. If you are not confident about your skills then you will get rejected.

Angular JS is one of the most popular JavaScript frameworks and is used in almost every large-scale web project. In this article, we will discuss some Angular JS interview questions. We are going to discuss about Angular JS, its advantages and how to answer angular js interview questions. Let’s start our discussion.

Best Angular JS Interview Questions:

What is AngularJS?

AngularJS is a client-side Javascript framework, developed by Google. It is mainly used for building dynamic web applications. AngularJS has been designed to be highly scalable. It uses HTML as a template language and it is used to develop Single Page Applications (SPA).

How AngularJS works?

AngularJS allows you to write code in the HTML language. It also has a powerful data binding feature, which enables you to write code only once and it will work automatically. Moreover, it provides a lot of reusable components, like, modules, filters and services.

What is the difference between AngularJS and Angular 2?

There is no major difference between AngularJS and Angular 2. Angular 2 is a new version of AngularJS, but there are some differences. We can say that Angular 2 is more stable than AngularJS. You will get lots of new features in AngularJS.

Why AngularJS is popular?

AngularJS is popular because it’s highly scalable, easy to use, maintainable and provides many reusable components and modules. 

What is the difference between controllers and directives?

The main difference between them is that a directive controls DOM elements whereas a controller controls HTML elements and models. If you need to make changes to the DOM elements, then you can use directives. But if you need to change model data then you can use controllers.

What is MVC pattern?

The Model-View-Controller (MVC) design pattern is a software design pattern that helps separate an application into a collection of discrete components.

Model – The model contains the data and logic of an application. In most cases, it consists of the database, business objects, and any other data or logic that needs to be shared throughout an application.

View – The view provides a user interface for interacting with the model and presenting information to the user. In most cases, this would be a window or some other visual display that allows the user to interact with the application.

Controller – The controller acts as the mediator between the view and the model. It receives user input and passes it along to the model, which updates the model accordingly, and then displays the updated data to the user. This also includes the processing of input that comes from the user, such as keyboard or mouse events.

What is MVVM pattern?

Model View ViewModel (MVVM) is another popular pattern that works on Model View ViewModel. In this pattern, view model contains the code that communicates with the model layer and vice-versa. The model layer provides services for the view and view model layer. It has three major components: View Model, View and Model.

What are the advantages of using AngularJS?

– You can easily build Single Page Applications (SPA).
– You can develop reusable components.
– It’s easy to use.
– It is easy to learn.
– It is highly scalable.
– It is easy to maintain.

Define AngularJS and what are its key features?

AngularJS is a JavaScript framework developed by Google in 2009. It’s a client-side library that allows you to create dynamic websites without having to deal with server-side programming languages such as PHP, Ruby, and Java. The best thing about AngularJS is that it has a strong focus on MVC (Model-View-Controller) architecture. So, it allows you to write less code while achieving better results.

Define Scope in AngularJS.

Scope is the region where AngularJS operates. In simple terms, it is the scope of a controller, which is the area of the HTML document that a controller can interact with. For example, a controller can access its own data (its $scope.variable), but it can’t access the data of other controllers or other documents. So in a nutshell, the scope is the region where AngularJS operates.

What do the services represent in AngularJS?

Services are objects that provide functionality for other objects in an application. They are often used to decouple the code, and make it easier to test and reuse the parts of the application.

What are directives?

Directives are special JavaScript objects that let you manipulate the DOM (Document Object Model) of your website. In AngularJS, directives are used to create reusable components that can be inserted anywhere on the page. They are like mini-frameworks that help you build more complicated applications in a faster way.

Explain the data binding process in AngularJS.

Data binding is a way of attaching properties from one DOM element to another, and it’s a very important concept in AngularJS. When we talk about the binding process in AngularJS, we usually refer to the two-way data binding that allows you to transfer values between the model and the view. This makes the UI more responsive, and the data easier to display.

But data binding is much more than this, as it allows you to bind the values between different components and controllers as well, which makes it easier to communicate between them.

Best Angular JS interview Questions for Experienced

Explain the purpose of interpolation in AngularJS?

Interpolation in AngularJS helps the framework to determine which animation should be played next based on its timing. For example, if a new element is added to a DOM, AngularJS checks how far in the future this will happen, and then it determines whether the previous animation should be paused or restarted. It does this by calculating the time difference between the current timestamp and the event that triggers the animation.

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