Angular%20JS%20Interview%20Questions%20and%20Answers
Experienced / Expert level questions & answers
Ques 1. Is AngularJS a library, framework, plugin or a browser extension?
AngularJS fits the definition of a framework the best, even though it's much more lightweight than a typical framework and that's why many confuse it with a library.
AngularJS is 100% JavaScript, 100% client side and compatible with both desktop and mobile browsers. So it's definitely not a plugin or some other native browser extension.
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Ques 2. Do you know what is Angulars performance like?
The startup time heavily depends on your network connection, state of the cache, browser used and available hardware, but typically we measure bootstrap time in tens or hundreds of milliseconds.
The runtime performance will vary depending on the number and complexity of bindings on the page as well as the speed of your backend (for apps that fetch data from the backend). Just for an illustration we typically build snappy apps with hundreds or thousands of active bindings.
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Ques 3. Can you explain the concept of scope hierarchy? How many scopes can an application have?
Each Angular application has exactly one root scope, but may have several child scopes. The application can have multiple scopes, because child controllers and some directives create new child scopes. When new scopes are created, they are added as children of their parent scope. This creates a hierarchical structure similar to the DOM where they're attached.
When Angular evaluates a bound variable like say {{firstName}}, it first looks at the scope associated with the given element for the firstName property. If no such property is found, it searches the parent scope and so on until the root scope is reached. In JavaScript this behaviour is known as prototypical inheritance, and child scopes prototypically inherit from their parents. The reverse is not true. i.e. the parent can't see it's children's bound properties.
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Ques 4. Do I need to worry about security holes in AngularJS?
Like any other technology, AngularJS is not impervious to attack. Angular does, however, provide built-in protection from basic security holes including cross-site scripting and HTML injection attacks. AngularJS does round-trip escaping on all strings for you and even offers XSRF protection for server-side communication.
AngularJS was designed to be compatible with other security measures like Content Security Policy (CSP), HTTPS (SSL/TLS) and server-side authentication and authorization that greatly reduce the possible attack vectors and we highly recommended their use.
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Ques 5. What are the key differences between AngularJS and jQuery?
AngularJS and jQuery are the Javascript frameworks and are different with each other, so never mix up the AngularJS and jQuery code in your project. Use only one Javascript framework at a time. If you are starting a new project, must consider AngularJS over jQuery. If you are a experienced jQuery developer, then you have to invest some time to work in AngularJS way. There are a lot of difference between AngularJS and jQuery.
1. Web designing approach in jQuery and AngularJS
In jQuery, you design a page, and then you make it dynamic. This is because jQuery was designed for augmentation and has grown incredibly from that simple premise.
But in AngularJS, you must start from the ground up with your architecture in mind. Instead of starting by thinking "I have this piece of the DOM and I want to make it do X", you have to start with what you want to accomplish, then go about designing your application, and then finally go about designing your view.
2. Don't augment jQuery with AngularJS
Similarly, don't start with the idea that jQuery does X, Y, and Z, so I'll just add AngularJS on top of that for models and controllers. This is really tempting when you're just starting out, which is why I always recommend that new AngularJS developers don't use jQuery at all, at least until they get used to doing things the "Angular Way".
I've seen many developers here and on the mailing list create these elaborate solutions with jQuery plugins of 150 or 200 lines of code that they then glue into AngularJS with a collection of callbacks and $applys that are confusing and convoluted; but they eventually get it working! The problem is that in most cases that jQuery plugin could be rewritten in AngularJS in a fraction of the code, where suddenly everything becomes comprehensible and straightforward.
The bottom line is this: when solutioning, first "think in AngularJS"; if you can't think of a solution, ask the community; if after all of that there is no easy solution, then feel free to reach for the jQuery. But don't let jQuery become a crutch or you'll never master AngularJS.
3. Always think in terms of architecture
First know that single-page applications are applications. They're not webpages. So we need to think like a server-side developer in addition to thinking like a client-side developer. We have to think about how to divide our application into individual, extensible, testable components.
So then how do you do that? How do you "think in AngularJS"? Here are some general principles, contrasted with jQuery.
The view is the "official record"
In jQuery, we programmatically change the view. We could have a dropdown menu defined as a ul like so:
<ul class="main-menu">
<li class="active">
<a href="#/home">Home</a>
</li>
<li>
<a href="#/menu1">Menu 1</a>
<ul>
<li><a href="#/sm1">Submenu 1</a></li>
<li><a href="#/sm2">Submenu 2</a></li>
<li><a href="#/sm3">Submenu 3</a></li>
</ul>
</li>
<li>
<a href="#/home">Menu 2</a>
</li>
</ul>
In jQuery, in our application logic, we would activate it with something like:
$('.main-menu').dropdownMenu();
When we just look at the view, it's not immediately obvious that there is any functionality here. For small applications, that's fine. But for non-trivial applications, things quickly get confusing and hard to maintain.
In AngularJS, though, the view is the official record of view-based functionality. Our ul declaration would look like this instead:
<ul class="main-menu" dropdown-menu>
...
</ul>
These two do the same thing, but in the AngularJS version anyone looking at the template knows what's supposed to happen. Whenever a new member of the development team comes on board, he can look at this and then know that there is a directive called dropdownMenu operating on it; he doesn't need to intuit the right answer or sift through any code. The view told us what was supposed to happen. Much cleaner.
Developers new to AngularJS often ask a question like: how do I find all links of a specific kind and add a directive onto them. The developer is always flabbergasted when we reply: you don't. But the reason you don't do that is that this is like half-jQuery, half-AngularJS, and no good. The problem here is that the developer is trying to "do jQuery" in the context of AngularJS. That's never going to work well. The view is the official record. Outside of a directive (more on this below), you never, ever, never change the DOM. And directives are applied in the view, so intent is clear.
Remember: don't design, and then mark up. You must architect, and then design.
Data binding
This is by far one of the most awesome features of AngularJS and cuts out a lot of the need to do the kinds of DOM manipulations I mentioned in the previous section. AngularJS will automatically update your view so you don't have to! In jQuery, we respond to events and then update content. Something like:
$.ajax({
url: '/myEndpoint.json',
success: function ( data, status ) {
$('ul#log').append('<li>Data Received!</li>');
}
});
For a view that looks like this:
<ul class="messages" id="log">
</ul>
Apart from mixing concerns, we also have the same problems of signifying intent that I mentioned before. But more importantly, we had to manually reference and update a DOM node. And if we want to delete a log entry, we have to code against the DOM for that too. How do we test the logic apart from the DOM? And what if we want to change the presentation?
This a little messy and a trifle frail. But in AngularJS, we can do this:
$http( '/myEndpoint.json' ).then( function ( response ) {
$scope.log.push( { msg: 'Data Received!' } );
});
And our view can look like this:
<ul class="messages">
<li ng-repeat="entry in log">{{ entry.msg }}</li>
</ul>
But for that matter, our view could look like this:
<div class="messages">
<div class="alert" ng-repeat="entry in log">
{{ entry.msg }}
</div>
</div>
And now instead of using an unordered list, we're using Bootstrap alert boxes. And we never had to change the controller code! But more importantly, no matter where or how the log gets updated, the view will change too. Automatically. Neat!
Though I didn't show it here, the data binding is two-way. So those log messages could also be editable in the view just by doing this:
<input ng-model="entry.msg" />.
And there was much rejoicing.
Distinct model layer
In jQuery, the DOM is kind of like the model. But in AngularJS, we have a separate model layer that we can manage in any way we want, completely independently from the view. This helps for the above data binding, maintains separation of concerns, and introduces far greater testability. Other answers mentioned this point, so I'll just leave it at that.
Separation of concerns
And all of the above tie into this over-arching theme: keep your concerns separate. Your view acts as the official record of what is supposed to happen (for the most part); your model represents your data; you have a service layer to perform reusable tasks; you do DOM manipulation and augment your view with directives; and you glue it all together with controllers. This was also mentioned in other answers, and the only thing I would add pertains to testability, which I discuss in another section below.
Dependency injection
To help us out with separation of concerns is dependency injection (DI). If you come from a server-side language (from Java to PHP) you're probably familiar with this concept already, but if you're a client-side guy coming from jQuery, this concept can seem anything from silly to superfluous to hipster. But it's not.
From a broad perspective, DI means that you can declare components very freely and then from any other component, just ask for an instance of it and it will be granted. You don't have to know about loading order, or file locations, or anything like that. The power may not immediately be visible, but I'll provide just one (common) example: testing.
Let's say in our application, we require a service that implements server-side storage through a REST API and, depending on application state, local storage as well. When running tests on our controllers, we don't want to have to communicate with the server - we're testing the controller, after all. We can just add a mock service of the same name as our original component, and the injector will ensure that our controller gets the fake one automatically - our controller doesn't and needn't know the difference.
4. Test-driven development
This is really part of section 3 on architecture, but it's so important that I'm putting it as its own top-level section.
Out of all of the many jQuery plugins you've seen, used, or written, how many of them had an accompanying test suite? Not very many because jQuery isn't very amenable to that. But AngularJS is.
In jQuery, the only way to test is often to create the component independently with a sample/demo page against which our tests can perform DOM manipulation. So then we have to develop a component separately and then integrate it into our application. How inconvenient! So much of the time, when developing with jQuery, we opt for iterative instead of test-driven development. And who could blame us?
But because we have separation of concerns, we can do test-driven development iteratively in AngularJS! For example, let's say we want a super-simple directive to indicate in our menu what our current route is. We can declare what we want in our view:
<a href="/hello" when-active>Hello</a>
Okay, now we can write a test:
it( 'should add "active" when the route changes', inject(function() {
var elm = $compile( '<a href="/hello" when-active>Hello</a>' )( $scope );
$location.path('/not-matching');
expect( elm.hasClass('active') ).toBeFalsey();
$location.path( '/hello' );
expect( elm.hasClass('active') ).toBeTruthy();
}));
We run our test and confirm that it fails. So now we can write our directive:
.directive( 'whenActive', function ( $location ) {
return {
scope: true,
link: function ( scope, element, attrs ) {
scope.$on( '$routeChangeSuccess', function () {
if ( $location.path() == element.attr( 'href' ) ) {
element.addClass( 'active' );
}
else {
element.removeClass( 'active' );
}
});
}
};
});
Our test now passes and our menu performs as requested. Our development is both iterative and test-driven.
5. Conceptually, directives are not packaged jQuery
You'll often hear "only do DOM manipulation in a directive". This is a necessity. Treat it with due deference!
But let's dive a little deeper...
Some directives just decorate what's already in the view (think ngClass) and therefore sometimes do DOM manipulation straight away and then are basically done. But if a directive is like a "widget" and has a template, it should also respect separation of concerns. That is, the template too should remain largely independent from its implementation in the link and controller functions.
AngularJS comes with an entire set of tools to make this very easy; with ngClass we can dynamically update the class; ngBind allows two-way data binding; ngShow and ngHide programmatically show or hide an element; and many more - including the ones we write ourselves. In other words, we can do all kinds of awesomeness without DOM manipulation. The less DOM manipulation, the easier directives are to test, the easier they are to style, the easier they are to change in the future, and the more re-usable and distributable they are.
I see lots of developers new to AngularJS using directives as the place to throw a bunch of jQuery. In other words, they think "since I can't do DOM manipulation in the controller, I'll take that code put it in a directive". While that certainly is much better, it's often still wrong.
Think of the logger we programmed in section 3. Even if we put that in a directive, we still want to do it the "Angular Way". It still doesn't take any DOM manipulation! There are lots of times when DOM manipulation is necessary, but it's a lot rarer than you think! Before doing DOM manipulation anywhere in your application, ask yourself if you really need to. There might be a better way.
Here's a quick example that shows the pattern I see most frequently. We want a toggleable button. (Note: this example is a little contrived and a skosh verbose to represent more complicated cases that are solved in exactly the same way.)
.directive( 'myDirective', function () {
return {
template: '<a class="btn">Toggle me!</a>',
link: function ( scope, element, attrs ) {
var on = false;
$(element).click( function () {
if ( on ) {
$(element).removeClass( 'active' );
}
else {
$(element).addClass( 'active' );
}
on = !on;
});
}
};
});
There are a few things wrong with this. First, jQuery was never necessary. There's nothing we did here that needed jQuery at all! Second, even if we already have jQuery on our page, there's no reason to use it here; we can simply use angular.element and our component will still work when dropped into a project that doesn't have jQuery. Third, even assuming jQuery was required for this directive to work, jqLite (angular.element) will always use jQuery if it was loaded! So we needn't use the $ - we can just use angular.element. Fourth, closely related to the third, is that jqLite elements needn't be wrapped in $ - the element that is passed to the link function would already be a jQuery element! And fifth, which we've mentioned in previous sections, why are we mixing template stuff into our logic?
This directive can be rewritten (even for very complicated cases!) much more simply like so:
.directive( 'myDirective', function () {
return {
scope: true,
template: '<a class="btn" ng-class="{active: on}" ng-click="toggle()">Toggle me!</a>',
link: function ( scope, element, attrs ) {
scope.on = false;
scope.toggle = function () {
scope.on = !scope.on;
};
}
};
});
Again, the template stuff is in the template, so you (or your users) can easily swap it out for one that meets any style necessary, and the logic never had to be touched.
And there are still all those other benefits, like testing - it's easy! No matter what's in the template, the directive's internal API is never touched, so refactoring is easy. You can change the template as much as you want without touching the directive. And no matter what you change, your tests still pass.
So if directives aren't just collections of jQuery-like functions, what are they? Directives are actually extensions of HTML. If HTML doesn't do something you need it to do, you write a directive to do it for you, and then use it just as if it was part of HTML.
Put another way, if AngularJS doesn't do something out of the box, think how the team would accomplish it to fit right in with ngClick, ngClass, et al.
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Ques 6. How will you display different images based on the status being red, amber, or green?
Use the ng-switch and ng-switch-when directives as shown below.
<div ng-switch on="account.status">
<div ng-switch-when="AMBER">
<img class="statusIcon"
src='apps/dashboard/amber-dot.jpg' />
</div>
<div ng-switch-when="GREEN">
<img class="statusIcon"
src='apps/dashboard/green-dot.jpg' />
</div>
<div ng-switch-when="RED">
<img class="statusIcon"
src='apps/dashboard/red-dot.jpg' />
</div>
</div>
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Ques 7. How will you show/hide buttons and enable/disable buttons conditionally?
Using the ng-show and ng-disabled directives.
<div class="dataControlPanel"
ng-show="accounts.releasePortfolios">
<div class="dataControlButtons">
<button class="btn btn-primary btn-small"
ng-click="saveComments()" ng-disabled="disableSaveButton">Save</button>
<button class="btn btn-primary btn-small"
ng-click="releaseRun()" ng-disabled="disableReleaseButton">Release</button>
</div>
</div>
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Ques 8. How will you loop through a collection and list each item?
Using the ng-repeat directive.
<table
class="table table-bordered table-striped table-hover table-fixed-head portal-data-table">
<thead>
<tr>
<th>account</th>
<th>Difference</th>
<th>Status</th>
</tr>
</thead>
<tbody>
<tr
ng-repeat="account in acounts">
<td width="40%">{{account.accountCode}}</td>
<td width="30%" style="text-align: right">{{account.difference
| currency: ""}}</td>
<td width="30%">
<div ng-switch on="account.status">
<div ng-switch-when="AMBER">
<img class="statusIcon"
src='apps/dashboard/amber-dot.jpg' />
</div>
<div ng-switch-when="GREEN">
<img class="statusIcon"
src='apps/dashboard/green-dot.jpg' />
</div>
<div ng-switch-when="RED">
<img class="statusIcon"
src='apps/dashboard/red-dot.jpg' />
</div>
</div>
</td>
</tr>
</tbody>
</table>
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Ques 9. How will you display inprogress revolving image to indicate that RESTful data is bing loaded?
<div ng-show="loading">
<img class="loading" src="portal/images/loading_32.gif" />
</div>
$scope.loadReportData = function($http) {
$scope.loading = true; // start spinng the image
$http(
{
method : 'GET',
url : propertiesService.get('restPath')
+ '/myapp/portfolio/'
+ $scope.clientId
+ '/'
+ dateService
.userToRest($scope.reportDate),
cacheBreaker : true
}).success(
function(data, config) {
$scope.reportData = data;
portal.log('reportData: ',
$scope.reportData);
$scope.loading = false; // stop spinning the image
}).error(
function(data, status, headers, config) {
if(data.errorMsg != null) {
$scope.httpError = data.errorMsg;
}
else {
$scope.httpError = "Error retrieving data from " + errorService
.getApacheErrorTitleMessage(status,
data, config);
}
$scope.loading = false; // stop spinning the image
});
};
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