Top 25 AngularJS Interview Questions & Answers

Many newcomers have a question “What is AngularJS?” and definitely don’t expect questions about it during an interview. In the reply you can say AngularJS is an MVC framework to design web applications. It helps to enrich HTML for a great extent. Using AngularJS, you can build structural & high performance based web applications. The directive is one of the most influential features in AngularJS. AngularJS comes with many in-built directives. Even you can Create your own. Google powers AngularJS..

 Due this is a newly introduced technology, there are a lot of vacancies available for AngularJS developers.

More questions:

Q: What are the new features of Angular?

• Component-Based–  components are the base for Angular now. Controllers and scope are no longer used. Components and directives have replaced them.
• Directives– The specification for directives is considerably simpler, although they are still subject to change. With the @Directive annotation, a directive can be declared.
• Dependency Injection– Because of the improved dependency injection model in Angularinformationthere are more opportunities for component / object-based work.
• Use of TypeScript-TypeScript is a typed super set of JavaScript which has been built and maintained by Microsoft and chosen by the AngularJS team for development. The presence of types makes the code written in TypeScript less prone to run-time errors. In recent times, the support for ES6 has been greatly improved and a few features from ES7 have been added as well.
• Generics– TypeScript has generics which can be used in the frontend.
• Lambdas with TypeScript– In TypeScript, lambdas are available.
• Forms and Validations– Forms and validations are an essential aspect of frontend development. Within Angular 2 the Form Builder and Control Group are defined.

Q: What is the need for Angular?
A: Angular is not just a regular upgrade but a new development. The whole framework is rewritten from the ground. Angular got rid of many things like $scope, controllers, DDO, jqLite, angular.Module etc. It uses components for almost everything. Imagine that even the whole app is now a component. Also, it takes advantage of ES6 / TypeScript syntax. Developing Angular 2 apps in TypeScript has made it even more powerful. Apart from that, many things have evolved and re-designed the template engine and many more.

Q: What is TypeScript?
A: TypeScript is a typed super set of JavaScript which has been built and maintained by Microsoft and chosen by the AngularJS team for development. The presence of types makes the code written in TypeScript less prone to run-time errors. In recent times, the support for ES6 has improved, and a few features from ES7 have been added as well.

Q: What is a component in AngularJs?
A: In Angular, a Component is a particular kind of directive that uses a more straightforward configuration which is suitable for a component-based application structure.

Q: What is @Inputs in Angular?
A:@Input allows you to pass data into your controller and templates through HTML and to define custom properties. This allows you to quickly reuse components and have them display different values for each instance of the renderer.