You want to subscribe to two observables obs1$ and obs2$ and combine their latest values whenever either emits. Which RxJS operator should you use before subscribing?

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Angular - RxJS and Observables Fundamentals

You want to subscribe to two observables obs1$ and obs2$ and combine their latest values whenever either emits. Which RxJS operator should you use before subscribing?

Afilter

Bmap

CcatchError

DcombineLatest

Step-by-Step Solution

Solution:

Step 1: Understand the need to combine latest values
You want to react to the latest values from both observables whenever either emits.
Step 2: Identify the correct RxJS operator
combineLatest emits an array of latest values from all observables whenever any emits.
Final Answer:
combineLatest -> Option D
Quick Check:
Combine latest values = combineLatest operator [OK]

Quick Trick: Use combineLatest to merge latest values from multiple observables [OK]

Common Mistakes:

MISTAKES

Using map which transforms but doesn't combine
Using filter which only filters emissions
Using catchError which handles errors, not combining

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More Angular Quizzes

You want to subscribe to two observables obs1$ and obs2$ and combine their latest values whenever either emits. Which RxJS operator should you use before subscribing?

Step 1: Understand the need to combine latest values

Step 2: Identify the correct RxJS operator

Final Answer:

Quick Check:

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