Google created AngularJS, which is the most widely used open-source JavaScript-based framework. Its main goal is to make large-scale, enterprise-level, dynamic single-page web applications easier to use by extending the HTML syntax and sticking to the MVC (Model-View-Controller) architecture. When AngularJS is used to build an enterprise-level web application, it will work in all browsers, be easy to update, and be responsive. Misko Hevery and Adam Abrons created it in 2009, and Google is still responsible for its upkeep today. We will look at Angular JS Interview Questions.
AngularJS v1.8.2 is the current stable release as of October 2020. Thousands of developers all over the world use AngularJS as their go-to framework for building online apps. This is because it is easy to learn, easy to use, and puts a lot of focus on developing logic on the client side.
In this regard, AngularJS stands out as a promising language. This technology is worth the effort as it contains many valuable features.
This blog is a collection of the top AngularJS interview questions and answers for freshmen candidates with 3-5 years of experience and experienced candidates.
Let’s start!
Top 10 Angular JS Interview Questions
- With AngularJS, what exactly is data binding?
- Why does AngularJS have the concept of scope?
- In AngularJS, what exactly are the controllers?
- What do AngularJS’s services entail?
- How do you use AngularJS filters?
- Outline the function of AngularJS directives.
- AngularJS templates: please explain.
- What exactly does “routing” mean in AngularJS?
- When using AngularJS, what exactly does “deep linking” entail?
- To what extent does AngularJS excel, exactly?
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Prepare for Your First AngularJS Interview: For Beginners
Q. What do the different AngularJS services mean?
Services are separate things that do the things they were designed to do. Dependency injection lets them talk to each other and connect, enabling the framework to manage and distribute code. AngularJS comes with several valuable services already built in. AngularJS makes it easier for developers to rely more and more on custom services.
Q. Find the differences between the ng-if and ng-show directives.
If the condition you set with the ng-if directive isn’t proper, the part of the DOM element you specify won’t be shown. If that weren’t drawn, the element’s context would be lost. But if the ng-show directive’s condition isn’t met, the DOM element is still rendered but hidden from view
(by adding the ng-hide class to the DOM element).
Q. Why does $watch do what it does?
The $watch variable stores the previous and current values of the expression or model variable
being watched.
Q. What exactly are directives?
In AngularJS, directives are essential parts of elements. They replace the DOM element
markers and add functionality to DOM elements like their names, attributes, CSS classes, and comments. They are used to make HTML tags that work like widgets but are specific to each person. AngularJS has directives like ng-model for critical data, ng-repeat for repeating components, ng-app for starting up AngularJS apps, ng-show and ng-hide for changing the visibility of DOM elements, etc.
Q. What is the purpose of AngularJS’s interpolation feature?
Interpolation provides critical information by putting expressions into attribute and text nodes. During compilation, the compiler’s job is to look for matches between the text and the attributes. If AngularJS finds markup with embedded expressions, it will use the built-in service $interpolate to update the markup and register it as a watch.
Q. AngularJS: What is the digest cycle?
It is a fundamental step in AngularJS’s data binding procedure. At the end of each digest cycle, the value of the scope model is compared to its previous iteration.
The digestion process begins on its own. If we want to start the digestion cycle by hand, we can make it easier using $apply ().
Q. Describe the variations between one-way and two-way binding.
This technique is used because automatic updates to the HTML template or view are impossible with one-way binding.
So, we need to build custom code to update the view every time a data-bind occurs between the model and the idea to update the HTML template.
When using two-way binding, the HTML template is automatically updated without additional code being written to connect the data from the model to the view and vice versa (i.e., view to model).
Angular JS Interview Questions For Experienced Professionals
Q. What is the difference between the scope of a directive and the scope of a controller?
The values “$scope” and “scope” both refer to the same “scope” object. That’s because of the names we give them. Knowing about isolated scope directives can help clarify the distinction between scope and $scope.
Q. When should you use $location?
The $location Angular service stores the current URL of the application and makes it available to the application’s controller. All changes made to the $location in the controller will be mirrored in the URL bar, and vice versa.
Q. Where does Link fit in with compile?
Compiling is a service because it looks through your HTML, finds all your directives, and then gives you back a link function.
As opposed to this, Link mixes the model with a perspective. Every viewpoint alters the model, and every model changes the outlook.
Q. Define the idea of a tight conceptual escape.
AngularJS thinks all values are unsafe when they come from HTML or a URL that could be dangerous. When AngularJS binds an untrusted value, it either checks for security (using sanitizations, safe lists, etc., depending on the situation) or throws an exception. This behavior is highly context-dependent; whereas HTML can be cleaned up, template URLs cannot.
In this regard, the ng-bind-HTML directive serves as an example. Its value is displayed in HTML format. If a sanitizer is present, AngularJS will use it to clean up any untrusted data before showing it. You must first mark it as trusted to avoid sanitization and indicate unmodified input.
Q. In what situations would one use a form action to call a server method rather than $http?
The difference between when to use a redirect, a form action, and an HTTP request is that the former is used when the server-side method leads to a redirect and when the method returns data.
Q. Can a parent controller access the methods of a child controller, or vice versa?
A parent controller can’t call methods on a child controller, but that doesn’t mean a child controller can’t call methods on a parent controller.
Conclusion
AngularJS was first made to standardize dependency injection and make it easier to make single-page applications. Since then, it has grown in what it can do. Even though AngularJS is the first version of the framework, many businesses use it because it has many benefits, is flexible, and is easy to set up. Over the years, AngularJS has changed a lot, but it is still the most popular framework for making business-focused web applications.
This post should have taught you the basics of AngularJS and some more advanced ideas about it. These AngularJS interview questions and answers are all-inclusive and can help you ace any interview, whether you’re a complete beginner or a seasoned pro. Such questions are often asked during interviews.
Nearly every interview will pit you against stiff competition, and if you want to succeed and land your dream job, you’ll have to fight to the finish. For more interactive topics, visit educationnest.com
