Core Collections · interview question

A teammate submits shaky aggregation patterns code. Which review comment is the strongest?

Multiple choiceHardchapter-3-curatedpremiumcore-collectionsaggregation-patterns

Make the rule clearer and easier to explain. Write aggregation steps so the reader can see where counts come from and which key controls the grouping.Solve the symptom with comments only and avoid changing the code shape around aggregation patterns.Delay clarity until production traffic reveals the edge case and then patch it under pressure.Keep aggregation patterns implicit so the script stays short and hope the next engineer infers the rule.

Answer and explanation

Correct answer

A. Make the rule clearer and easier to explain. Write aggregation steps so the reader can see where counts come from and which key controls the grouping.

Why

The best review comment anchors the change to readability, correctness, and future maintenance. Implicit aggregation logic tends to produce plausible but wrong summaries.

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A teammate submits shaky aggregation patterns code. Which review comment is the strongest?

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