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okay, let's dive into the world of rxjs interview questions! this guide will cover a wide range of questions, from fundamental concepts to more advanced topics, along with explanations, code examples, and potential follow-up questions.

*i. fundamentals of rxjs*

*1. what is rxjs?*

*answer:* rxjs (reactive extensions for javascript) is a library for composing asynchronous and event-based programs using observable sequences. it combines the best ideas from the observer pattern, the iterator pattern, and functional programming to manage data streams and react to changes over time.

*key concepts:*

*observables:* represent streams of data that can emit multiple values over time.
*observers:* consume the values emitted by observables.
*operators:* functions that transform, filter, combine, or manipulate observables.
*subjects:* act as both an observable and an observer, allowing multicast behavior.
*schedulers:* control the concurrency and timing of observables.

*example:*



*follow-up questions:*
why use rxjs over native promises or async/await?
what are the advantages of reactive programming?
what problems does rxjs solve?

*2. what are observables and observers? how do they interact?*

*answer:*
*observables:* are the data sources. they represent a stream of values that can be emitted over time. an observable does nothing until it's subscribed to.
*observers:* are the consumers of the data emitted by observables. they are objects with three methods: `next()`, `error()`, and `complete()`.

*interaction:* observables and observers interact through the `subscribe()` method. when an observer subscribes to an observable, it provides implementations for the `next()`, `error()`, and `complete()` methods. the observable then emits values by calling the `next()` method on the observer, and it signals the end of the stream by call ...

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