Which of the following is the correct way to apply a map transformation in Kafka Streams using Java?

easy📝 Syntax Q12 of Q15

Kafka - Streams

Astream.reduce((v1, v2) -> v1 + v2)

Bstream.filter(value -> value.length())

Cstream.mapValues(value -> value.toUpperCase())

Dstream.collect(Collectors.toList())

Step-by-Step Solution

Solution:

Step 1: Identify the map transformation syntax
In Kafka Streams, mapValues applies a function to each value, e.g., converting to uppercase.
Step 2: Match the correct syntax
stream.mapValues(value -> value.toUpperCase()) uses mapValues with a lambda toUpperCase(), which is correct.
Final Answer:
stream.mapValues(value -> value.toUpperCase()) -> Option C
Quick Check:
map transformation syntax = mapValues with lambda [OK]

Quick Trick: Map uses mapValues with a function on values [OK]

Common Mistakes:

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