User Interface and Angular Developer
User Interface and Angular Developer Interview Questions and Answers
Q1. What is the difference between Pure pipe and impure pipe?
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 ?
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?
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?
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
Q5. What is Directives in angular?
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
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
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
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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