Angular Javascript Interview Questions
Top 10 Angular JavaScript Interview Questions
Angular Javascript Interview Questions
In an Angular JavaScript interview, candidates may be asked questions about Angular concepts such as modules, components, services, data binding, forms, routing, and dependency injection. Employers may also inquire about TypeScript, observables, life cycle hooks, authentication, and error handling in Angular applications. Problem-solving skills, understanding of best practices, and familiarity with the latest features of Angular are usually assessed through coding challenges and scenario-based questions to evaluate a candidate's proficiency in developing web applications using Angular technology.
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1 - What is AngularJS and how is it different from other JavaScript frameworks?
AngularJS is a popular JavaScript framework developed by Google for building dynamic web applications. It is unique in its two way binding feature, where any changes in the model are automatically reflected in the view and vice versa. This helps in reducing the boilerplate code and making development faster.
2) Explain the concept of data binding in AngularJS.
Data binding in AngularJS is the automatic synchronization of data between the model and the view components. There are two types of data binding in AngularJS one way binding and two way binding. One way binding updates only the view when there are changes in the model, while two way binding updates both the model and the view simultaneously.
3) What is the difference between a service and a factory in AngularJS?
Services and factories in AngularJS are both types of Singleton objects that are responsible for reusable business logic throughout an application. The key difference lies in their implementation. Services are instantiated using the ‘new’ keyword, which treats them as constructors, while factories are defined by a factory function that returns an object.
4) How can you handle dependency injection in AngularJS?
Dependency injection in AngularJS is handled by the built in dependency injection subsystem. You can declare dependencies in the function signature in a predefined order, and AngularJS will resolve and inject them automatically when the function is invoked. This promotes modular and testable code by allowing components to be easily swapped and replaced.
5) What is the digest cycle in AngularJS and why is it important?
The digest cycle in AngularJS is the process where AngularJS checks all the watch expressions for changes and updates the view accordingly. This cycle is important for synchronizing the model and view components in AngularJS. By triggering the digest cycle whenever there are changes in the model, AngularJS ensures that the view is always up to date.
6) How do you optimize the performance of an AngularJS application?
To optimize the performance of an AngularJS application, you can employ various techniques such as using one time binding where appropriate, minimizing watchers, optimizing ng repeat loops, lazy loading modules, and components, using track by in ng repeat, and avoiding unnecessary DOM manipulations. Additionally, utilizing tools like AngularJS Batarang for debugging and profiling can help identify performance bottlenecks.
7) What are directives in AngularJS and how do they differ from components?
Directives in AngularJS are markers on a DOM element that tell Angular’s HTML compiler to attach a specified behavior to that element. They can be used to create custom HTML tags, attributes, classes, and comments that trigger specific functionality. Components, on the other hand, are a special kind of directive that uses a simpler configuration and has a more restricted feature set, making them easier to use and more concise for creating UI elements and functionality.
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