[Solved] Given the following Kafka Streams code, what will be the output messages after processing?stream.filter(value -> value.length() > 3) .map(value -> value.substring(0, 3))Input messages:... | Kafka

Kafka - Streams

Given the following Kafka Streams code, what will be the output messages after processing?

stream.filter(value -> value.length() > 3)
      .map(value -> value.substring(0, 3))

Input messages: ["apple", "cat", "banana", "dog"]

A["cat", "dog"]

B["app", "ban"]

C["apple", "banana"]

D["app", "cat", "ban", "dog"]

Step-by-Step Solution

Solution:

Step 1: Apply filter condition
Keep messages with length > 3: "apple" (5), "banana" (6). "cat" and "dog" are dropped.
Step 2: Apply map operation
Take first 3 characters: "apple" -> "app", "banana" -> "ban".
Final Answer:
["app", "ban"] -> Option B
Quick Check:
Filter then map = ["app", "ban"] [OK]

Quick Trick: Filter first, then map to transform filtered messages [OK]

Common Mistakes:

MISTAKES

Master "Streams" in Kafka

9 interactive learning modes - each teaches the same concept differently

More Kafka Quizzes

Given the following Kafka Streams code, what will be the output messages after processing?