User Interface and Angular Developer

User Interface and Angular Developer Interview Questions and Answers

Updated 23 Oct 2024

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Q1. What is the difference between Pure pipe and impure pipe?

Ans.

Pure pipes are stateless and only depend on input data, while impure pipes have internal state and can have side effects.

  • Pure pipes are faster and more efficient than impure pipes.

  • Pure pipes are used for simple transformations of data, while impure pipes are used for more complex transformations.

  • Examples of pure pipes include currency and date formatting, while examples of impure pipes include filtering and sorting.

  • To mark a pipe as pure, add the @Pipe({pure: true}) decorator...read more

Q2. What is the difference between Observable and promise ?

Ans.

Observables are streams of data that can be subscribed to, while promises are a one-time operation that returns a single value.

  • Observables can emit multiple values over time, while promises only return a single value.

  • Observables can be cancelled, while promises cannot.

  • Observables are lazy, meaning they only execute when subscribed to, while promises execute immediately.

  • Observables have operators that can transform, filter, and combine data, while promises do not.

  • Observables a...read more

Q3. What is the use of Interceptor in angular?

Ans.

Interceptors are used to intercept HTTP requests and responses to perform transformations or error handling.

  • Interceptors can be used to add headers to outgoing requests or handle errors in incoming responses.

  • They can also be used to modify the request or response before it is sent or received.

  • Interceptors can be global or specific to a certain request or response.

  • They are useful for implementing authentication, caching, or logging in an application.

  • Example: Adding an authoriz...read more

Q4. What is Dependency Injection in Angular?

Ans.

Dependency Injection is a design pattern used in Angular to inject dependencies into a component or service.

  • It allows for easier testing and maintenance of code

  • Dependencies are injected through the constructor of a component or service

  • Angular has its own Dependency Injection system built-in

  • Services can be shared across multiple components through Dependency Injection

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Q5. What is Directives in angular?

Ans.

Directives are markers on a DOM element that tell AngularJS to attach a specified behavior to that DOM element.

  • Directives are used to create reusable components.

  • They can be used to manipulate the DOM.

  • They can be used to add behavior to an existing DOM element.

  • They can be used to create custom attributes.

  • Examples include ng-repeat, ng-model, and ng-show.

Q6. Have you written any Custom directives

Ans.

Yes, I have written custom directives in Angular for specific UI functionalities.

  • Created a custom directive for form validation in Angular

  • Implemented a custom directive for dynamic styling of elements based on user input

  • Developed a custom directive for lazy loading images in Angular

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Q7. Difference promise and observable

Ans.

Promises are used for asynchronous operations that return a single value, while Observables are used for asynchronous operations that return multiple values over time.

  • Promises are eager and execute immediately upon creation

  • Observables are lazy and only execute when subscribed to

  • Promises can only return a single value

  • Observables can return multiple values over time

  • Promises cannot be cancelled once they are created

  • Observables can be cancelled by unsubscribing

  • Promises are not ca...read more

Q8. What is an Event loop

Ans.

Event loop is a mechanism in programming that allows for asynchronous execution of code.

  • Event loop is responsible for handling and executing events in a non-blocking manner.

  • It continuously checks the event queue and processes events one by one.

  • Event loop is commonly used in JavaScript to handle asynchronous operations like setTimeout, setInterval, and AJAX requests.

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