AngularJS Developer Interview Questions
Before Angular, there was AngularJS. Its dynamic views and expansive features left a lasting impact on web development. With this guide, delve into interview questions tailored to uncover the depth of a candidate's expertise in AngularJS. Navigate their understanding of directives, controllers, and services to ensure your legacy or transitional projects are in capable hands.
What is AngularJS?
Answer: AngularJS is an open-source JavaScript framework developed by Google for building dynamic web applications using HTML, CSS, and JavaScript.
2.
Explain two-way data binding in AngularJS.
Answer: Two-way data binding ensures that any changes in the model are immediately reflected in the view, and vice versa, without any additional effort.
3.
What are directives in AngularJS?
Answer: Directives are markers on a DOM element (attributes, elements, and more) that instruct AngularJS's HTML compiler to attach specified behavior to that DOM element.
4.
How is AngularJS different from jQuery?
Answer: While both are JavaScript libraries, AngularJS is a comprehensive framework for building web applications, whereas jQuery is mainly a library for DOM manipulation.
5.
What is the digest cycle in AngularJS?
Answer: The digest cycle automatically checks for changes in the values of the model and updates the view if there are any changes. It's the heart of AngularJS's two-way data binding.
6.
What are AngularJS expressions?
Answer: Expressions are used to bind application data to HTML. They can be written inside double braces like .
7.
Describe services in AngularJS.
Answer: Services are singletons that carry out specific tasks. They're used for reusable logic and can be injected into controllers, filters, and directives.
8.
What is the difference between a service and a factory?
Answer: Both are used to create a service. However, a service is a constructor function, while a factory is a function that returns an object.
9.
What are filters in AngularJS?
Answer: Filters format the value of an expression for display to the user. They can be used in view templates, controllers, or services.
10.
Explain routing in AngularJS.
Answer: Routing helps in creating a Single Page Application. With the $routeProvider, you can define what page to display when a URL is accessed.
11.
What is the purpose of ng-app, ng-init, and ng-model directives?
Answer: ng-app initializes an AngularJS application. ng-init initializes application data, and ng-model binds the value of an HTML control to application data.
12.
How does AngularJS handle AJAX?
Answer: AngularJS uses the $http service to handle AJAX requests, which returns a promise that allows chaining multiple success/error callback methods.
13.
Describe dependency injection in AngularJS.
Answer: Dependency injection is a design pattern in which components are given their dependencies instead of creating them internally. AngularJS uses this to manage and inject service instances.
14.
What are promises in AngularJS?
Answer: Promises are a way to handle asynchronous operations in AngularJS. They can be in one of three states: pending, resolved, or rejected.
15.
What's the difference between link and compile in directives?
Answer: Compile is used to transform the template DOM, and link is used to attach event listeners to instances of the template.
16.
What are isolated scopes in directives?
Answer: An isolated scope doesn't prototypically inherit from its parent scope. This makes directives more reusable as they don't inadvertently modify data in parent scopes.
17.
How can you share data between controllers?
Answer: One common way is using services. By injecting the same service into multiple controllers, you can share data.
18.
What are $rootScope and $scope?
Answer: $rootScope is the parent of all scopes in an AngularJS application, while $scope is specific to the controller and can inherit from $rootScope.
19.
How can you handle exceptions in AngularJS?
Answer: You can use the $exceptionHandler service to handle exceptions or write a custom exception handler.
20.
Explain the concept of a transclusion in AngularJS.
Answer: Transclusion allows for the insertion of a template into a directive. This is often used for creating reusable components.
21.
How do you handle security concerns in AngularJS?
Answer: Avoid using jQuery calls, always use the $sce service for trust assignments, sanitize user input, and ensure server-side validation.
22.
What are custom directives in AngularJS?
Answer: Custom directives allow developers to create their own, reusable directives beyond the standard set provided by AngularJS.
23.
How do you optimize an AngularJS application?
Answer: Minimize watchers, use one-time binding where applicable, implement pagination, and use lightweight DOM elements.
24.
What is the purpose of $watch, $digest, and $apply?
Answer: $watch listens to model changes, $digest checks all watchers for changes, and $apply integrates changes outside of AngularJS context into the AngularJS application.
25.
How do you use third-party libraries with AngularJS?
Answer: You can wrap third-party libraries in services or custom directives to integrate them seamlessly with the AngularJS ecosystem.
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