Angular 2 Plus Interview Questions

3 What are some disadvantages of using Angular?

Although Angular provides quite a lot of benefits, there are some disadvantages of using it as well. They are as follows:

  • Getting good SEO results on an Angular application can be a bit difficult and may need a bit of configuration.
  • Angular has a lot of features packed into it, so getting to know each of them and learning how to use them effectively together can be a little difficult.
  • Angular can add quite a lot of weight to your JavaScript bundle, so using it for smaller projects can be very inefficient and may significantly increase the load size.
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    5 How are observables different from promises?

    Although both promises and observables are used to handle asynchronous requests in JavaScript, they work in very different ways. Promises can only handle a single event at a time, while observables can handle a sequence of asynchronous events over a period of time. Observables also provide us with a wide variety of operators that allow us to transform data flowing through these observables with ease.

    A promise is just a way to wrap asynchronous operations so that they can be easily used, while an observable is a way to turn asynchronous operations into a stream of data that flows from a publisher to a subscriber through a well-defined path with multiple operations transforming the data along the way.

    What is Angular?

    Angular is an open-source web application development framework created by Google. It is used to build frontend, single-page applications that run on JavaScript. It is a full-fledged framework, i.e., it takes care of many aspects of frontend web applications such as HTTP requests, routing, layout, forms, reactivity, validation, etc.

    2 How do you define typings for custom elements?

    Defining typings for custom elements in Angular can be done by using NgElement and WithProperties exported from @angular/elements. The following component is a simple container with input property:

    What is a parameterized pipe?

    In Angular, pipes are used to transform the raw data into a required format before the final display to the end-users. These pipes are broadly categorized into 2 categories:

    Built-in Pipes are further divided into 2 types – Parameterized Pipes and Chaining Pipes.

    Parameterized Pipes refer to the pipes that carry parameters. We can use these pipes to pass n number of parameters by giving a colon (:) in the command.

    Topics Asked in Angular 2 Interview Questions

    In this section, we’ve listed several of the top basic concepts on which Angular 2 interview questions are asked. Practicing these fundamental Angular 2 topics will help you assess your preparation:

    1. In Angular 2, define and describe:Â

  • CLI
  • Routing
  • Components
  • @Outputs
  • Modules
  • Dependency Injection
  • Traceur compiler
  • Deep linkingÂ
  • String interpolation
  • Directive
  • Event emitters
  • RouterOutletÂ
  • ViewEncapsulation
  • Pipes
  • RxJS
  • Lazy Loading
  • AOT compilation
  • Router-link directive
  • Filters
  • Hooks
  • rootScope
  • PromisesÂ
  • Observables
  • Decorator
  • ProviderÂ
  • Services
  • PathMatch in angular routing
  • ResolverÂ
  • ActivatedroutesnapshotÂ
  • Router stateÂ
  • GulpÂ
  • HammerJSÂ
  • Arrow function
  • SubscribeÂ
  • Entry componentÂ
  • Internationalization in angular
  • Angular material design
  • Angular UI
  • ECMAScriptÂ
  • Flex layoutÂ
  • SPAÂ
  • Hidden propertyÂ
  • [email protected]Â
  • @outputÂ
  • Tree shaking
  • The factory methodÂ
  • RoutingÂ
  • BundlingÂ
  • Shadow dom
  • 2. What is the difference between:Â

  • constructor and ngOnInit
  • @injectable() and @inject()
  • directive and component
  • Observables and Promises
  • service() and a factory()
  • annotation and decoratorÂ
  • templateUrl and template
  • property binding and event binding
  • lazy loading and eager loading
  • ng-model and ng-bind
  • declarations and entryComponents
  • rootScope and scope
  • 3. Explain:

  • tsconfig.json file
  • package.json file
  • polyfills.ts file
  • systemjs.config.json file
  • app.module.ts file
  • Angular 2’s hidden property
  • Sample Angular 2 Interview Questions and Answers for Experienced Developers

    Here are some sample Angular 2 interview questions and answers that’d be more of interest to you if you have some experience:Â

    The purpose of the polyfills.ts file is to make the user application compatible with different browsers and help users with the necessary environmental setup required for ES6., using which we usually write code in Angular 2.

    Services offer modularity, more compartmentalization of concerns, and extract any common functionalities out of components. Adding services to your Angular 2 applications will make your components free from the data access code. Some features of services are:

  • Only a single instance of any service will exist in the entire application.
  • Services can return data in the form of promises and observables.
  • It is decorated with the help of @Injectable() decorator
  • Here are some component-specific hooks in Angular 2:Â

  • ngafterContentinit works to initialize the component content.
  • ngafterViewinit works to create the component view.
  • ngAfterConctentChecked works to check the binding of external content.
  • ngAfterviewChecked works to check the component view’s bindings.
  • Angular Interview Questions and Answers | Angular Interview Questions | Top Angular Questions

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