RxJS Interview Questions and Answers

Ques 26. Explain the concept of 'throttleTime' in RxJS.

'throttleTime' emits a value from the source Observable, then ignores subsequent values for a specified duration, ensuring a minimum time between emissions.

Example:

const throttledObservable = inputObservable.pipe(throttleTime(300));

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Ques 27. What is the purpose of the 'combineLatest' operator in RxJS?

'combineLatest' combines the latest values from multiple Observables into an array or using a provided function, emitting a new value whenever any of the combined Observables emit.

Example:

const combinedObservable = combineLatest(observable1, observable2, (value1, value2) => value1 + value2);

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Ques 28. Explain the concept of 'defer' in RxJS.

'defer' is used to create an Observable only when a subscriber subscribes, ensuring that each subscriber gets a fresh Observable instance.

Example:

const deferredObservable = defer(() => of('Deferred value'));

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Ques 29. 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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