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Create Great Apps with These AngularJS Interview Questions

Most Essential AngularJS Interview Questions

augularjs-interview-questionsOver the recent years, AngularJS has managed to create a huge amount of career opportunities, which generated (still does!) a lot of attention towards this framework. With the growing interest, more and more employers are starting to implement Angular into their workspaces. This means that AngularJS interview questions have become a very relevant topic amongst people who are actually looking for an Angular-related job.

In this tutorial, we are going to talk all about Angular interview questions – starting from the very basic ones and climbing all the way to AngularJS interview questions and answers for experienced developers. After that, we’ll talk about some general things that you could do to increase your confidence and chances of actually landing that dream job as an AngularJS developer.

Table of Contents

Introduction

As you can probably imagine, your employers will first of all want to know if you even have the most basic of an understanding of what AngularJS actually is and what it does. That’s why we’ll start from some of the more simple and basic questions and after you kind of develop a feeling of how all of this works, we’ll transition to some of the more advanced topics surrounding Angular.

Question 1: What is AngularJS?

You probably felt it coming, but the very first interview questions on AngularJS that we need to get out the way is what Angular even is in the first place?

You might think: I wouldn’t be reading this tutorial if I didn’t know what Angular is! Although that is probably true, a lot of employers like to test their potential employees by giving them very simple definition-based questions and observing how the wannabe employee explains the answers in his own words. This shows if he actually knows what he’s talking about or if he just memorized a couple of lines from a book and has no idea what Angular even is.

So… What is AngularJS?

AngularJS is an open-source web framework that is designed for the easier creation of single-page applications. Maintained mainly by Google, Angular tries to provide an improved experience when delving into the realm of front-end development.

Question 2: What are ‘directives’? What types of directives are there?

It’s one of the double AngularJS interview questions, yet the answer is actually pretty short and simple.

In AngularJS, directives are certain attributes that allow you to come up with your own, personal syntax for the application that you are developing. This grants your page a level of exclusivity and lets you add a personalized touch to the development process.

In total, there are four different types of directives: attribute, comment, CSS and element ones.

Question 3: How are ‘directives’ used?

In AngularJS, directives are used to extend specific HTML attributes. Furthermore, after the attributes are extended, Angular uses expressions to bind the data to the HTML.

Question 4: What are ‘expressions’?

augularjs-interview-questionsWhen it comes to interview questions on AngularJS, these basic definitions really do take up a big portion of the whole picture. However, it is very important to both know and be able to explain these basic, simple concepts in your own words.

As I’ve mentioned in the answer to the previous question, expressions in Angular are used to bind data in HTML. The issue arises when we notice that the way that Angular uses expressions is very similar to that of Java’s. So how does one differentiate between the two?

One of the main differentiating factors is that you can’t really use conditionals, exceptions and loops within the AngularJS expressions. However, you can do all of those things in Java. Another big point is that Angular allows you to filter your data before actually displaying it on the live servers – an option that Java lacks.

Question 5: Which browser is AngularJS not compatible with?

This is one of the many trick Angular interview questions that you might receive during your job interview. Don’t fall or it – your potential employers might want to test your knowledge by checking just how sure you are with your answer.

Angular is compatible with all of the current web browsers.

Question 6: Compare the ‘link’ and ‘compile’ functions.

Some of your AngualrJS interview questions might require you to compare and contrast certain specific Angular features. It is best to keep these comparisons short and simple, rather than to go on and try to look like a know-it-all, yet fail miserably.

Link’ is used to produce a live view. What it does is that it takes the directives and blends them with the scope.

The ‘compile’ function basically collects directives and alters certain DOM (Document Object Models) templates.

Question 7: What is ‘scope’?

In AngularJS, scopes trigger the execution of expressions. They are objects that are used to represent the application models.

Question 8: What are ‘templates’?

Templates are simply HTML pages that have your specific syntax applied to them. This means that you are able to implement your own data into the page so as to make it unique and original.

Question 9: What is ‘internationalization’?

When it comes to basic AngularJS interview questions and answers, this one might prove to be a bit of a bigger challenge. It honestly depends on just how deep your interviewer might want to go with it.

To put it very simply, internalization is a process where you would implement location-specific data into your website. The most common practice for this happens when you want to create a site that would be accessible by multiple languages.

This process is set to the default browser that the user is on at the time of accessing the site. If you wanted to make it location-specific, you would have to implement specific attributes depending on the targeted country.

Question 10: What’s the difference between ‘$scope’ and ‘$rootscope’?

Both of these functions are used to connect your personalizations with the live version of the webpage. The difference is that $scope has limited availability, while $rootscope can be accessed across-the-board.

We are nearing the AngularJS interview questions and answers for experienced developers, but there are still a few types of questions that we need to cover on a basic level.

Question 11: What’s the difference between ‘$’ and ‘$$’?

$” is used for public objects, while “$$” is used for objects that you want to maintain as private. These prefixes prevent confusion and accidental code conflictions.

Question 12: What is the main difference between AngularJS and Angular 2?

Although you might say this type of AngularJS interview questions seems subjective, a lot of developers and Angular users do agree on a single, specific main difference between the two versions of Angular.

This difference has got to do with the scripts that are used within these frameworks. AngularJS uses Javascript, while Angular 2 uses Typescript to create its apps.

Question 13: What is the most popular program to test AngularJS apps?

As of late, Jasmine is considered by many to be the go-to choice when looking for programs to test their created Angular applications. Jasmine is a framework that allows you to fully customize your tests and document the outcomes along the way.

Question 14: Is AngularJS compatible with mobile browsers?

Another one of the trick Angular interview questions, this might be a follow-up question that your potential employers ask you if you answer “compatible with all” the Question 5 on this list. Your interviewer might want to put your off balance and see if you’re positive with your answer. You should be – Angular works on both of the most popular mobile browsers – Mobile Chrome and iOS Safari.

Question 15: Name some of the advantages of using AngularJS.

Probably one of the most open-ended AngularJS interview questions, this is where you can truly show you motivation concerning using Angular. The type of answer that you provide will show what (which functions) you most likely prioritize when using this framework.

Some of the more popular and well-known advantages include, but are not limited to: adding custom animations and directives, allows form validations and MVC pattern implementations, supports full server communications, etc.

Essential AngularJS Interview Questions – Advanced

Now that you have some idea of just what the basic AngularJS interview questions should look like, we can transition and move on to AngularJS interview questions and answers for experienced developers. Don’t be intimidated with the term “advanced” – you (probably) won’t need to create a website from scratch during your job interview. Advanced interview questions on AngularJS simply means that your employers will conduct a deeper test of your knowledge on the topic – they might have follow-up questions, ask to give an example, etc.

I’ll mix these questions up to show as much variety as possible so that you could have a better understanding of what to expect in the second part of the interview.

Question 16: What validations does AnguarJS support?

Angular supports all of the HTML5 validations. If your potential employer requires an example, here are a few you can give: min, max, type=”499”, etc.

Question 17: What is “E2E testing”?

Although it might sound like one of the fancier AngularJS interview questions, the explanation behind E2E testing is actually pretty simple.

E2E” is an abbreviation of “end-to-end” testing. It is a form of testing that is focused on checking if your application runs properly and smoothly. As the name implies, the E2E testing is thorough and examines your app from front to back.

Question 18: How would you change the ‘start’ and ‘end’ symbols?

If you wanted to change the ‘start’ and ‘end’ symbols to custom ones, you could do so by entering the $interpolateprovider command into your config.

Question 19: How many ng-app directives can there be on a single HTML page?

Just one. If there is more than one application in your AngularJS file, the HTML document will choose the first ng-app directive and make it the root of the document.

Question 20: What is ‘$locale’?

The $locale function is used to define the location rules for your application. A great example of this would be when we talked about internalization on Question 9.

Question 21: Define “dependency injection”.

Dependency injection is a process where variable dependant objects are injected into the application instead of being brought there by a user.

Why would you need this? Well, one of the main uses for this is testing.

Question 22: What is ‘bootstrapping’?

Probably one of the easier explainable AngularJS interview questions, bootstrapping can simply be defined as running the Angular application that you have developed. Whilst using Angular, you can do this in two ways: manually or automatically.

Question 23: What’s ‘$routeprovider’?

$routeprovider accesses the controller and fetches you the URL parameters.

Question 24: Is it possible to implement SPA (Single Page Application) into Angular?

Yes – you would do so by accessing Angular routes.

Question 25: What’s the difference between controllers in AngularJS and Angular 2?

Yet again, another one of those trick AngularJS interview questions. Why is this a trick question, you might ask?

In AngularJS, controllers have pretty specific usages, one of the main ones being writing the application logic. However, when it comes to Angular 2, there are no longer any controllers left – instead, components take their place.

General Advice

So, that basically covers both the basics and the AngularJS interview question and answers for experienced developers. Naturally, there are many, many more different variations of Angular interview questions, but the ones provided in this tutorial should give you a general outlook on what to expect during the interview.

Now, let’s talk about some general advice. I won’t talk about the thousands of different things you should do before the interview – that would take a whole separate tutorial in of itself. What I will do, however, is give you some key tips that will aid you not only before or during the interview, but will also help you better understand what your employers want from a good candidate.

augularjs-interview-questions

First of all, self-confidence. You probably know all about how it is important to be (or at least act) confident so that your interviewer would think that you’ve done this a million times already and are secretly an expert. Well, while that’s all fine and dandy, I would like to remind you that there is a big difference between being confident and simply acting like a jerk. Don’t overdo it – if you manage to show humility during your job interview, your employers are likely to appreciate it.

Another thing is the actual question answering process. Remember – a lot of employers don’t really care too much for the answers themselves – rather, they are closely watching your reactions to their questions and evaluating your ability to answer those questions in a clear and concise manner. Body language, tone of voice, posture – all of these and many other things play a big part when trying to score that dream job.

Lastly, don’t overthink it. That’s usually the main thing that causes failure in a job interview – you come all nervous, that impacts your performance, and then after everything’s done you’re mad with yourself for not being able to show what you really can do because the nervousness kept getting in the way. Relax – chances are, your potential employers have seen this situation a billion times before. Just do the best you can to show your true personality, and let your knowledge on the Angular interview questions handle everything else.

Conclusions

So, we have reached the end of the “AngularJS Interview Questions tutorial”. We’ve covered everything from the basic to the more advanced stuff, and talked about some general things to keep in mind when preparing for that job interview.

I hope that this tutorial was useful for you, and that the information that you’ve learned will help you get that dream job. Good luck!

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