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Home / Interview Subjects / RxJS
WithoutBook LIVE Mock Interviews RxJS Related interview subjects: 19

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Know the top RxJS interview questions and answers for freshers and experienced candidates to prepare for job interviews.

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Know the top RxJS interview questions and answers for freshers and experienced candidates to prepare for job interviews.

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Freshers / Beginner level questions & answers

Ques 1

What is RxJS?

RxJS is a library for reactive programming using Observables, making it easier to compose asynchronous or callback-based code.

Example:

const observable = new Observable(observer => { observer.next('Hello'); });
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Ques 2

Explain what Observables are in RxJS.

Observables are data streams that emit a sequence of values over time. They can be subscribed to, and observers can react to emitted values.

Example:

const observable = new Observable(observer => { observer.next('First'); observer.next('Second'); });
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Ques 3

What is an Observer in RxJS?

An Observer is an interface that defines methods to handle the next, error, and complete events emitted by an Observable.

Example:

const observer = { next: value => console.log(value), error: err => console.error(err), complete: () => console.log('Completed') };
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Ques 4

What is the purpose of the 'pluck' operator in RxJS?

'pluck' is used to extract a specified property from each emitted object in an Observable stream.

Example:

const pluckedObservable = sourceObservable.pipe(pluck('name'));
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Ques 5

What is the purpose of the 'distinctUntilChanged' operator in RxJS?

'distinctUntilChanged' filters out consecutive duplicate values emitted by an Observable, only allowing distinct values to be emitted.

Example:

const distinctObservable = observable.pipe(distinctUntilChanged());
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Ques 6

Explain the use of the 'interval' function in RxJS.

'interval' creates an Observable that emits sequential numbers at a specified interval, creating a timer-like behavior.

Example:

const intervalObservable = interval(1000);
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Ques 7

What is the purpose of the 'take' operator in RxJS?

'take' is used to emit only the first n values emitted by an Observable and then complete.

Example:

const takenObservable = observable.pipe(take(3));
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