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Refactor a tangled 200-line function so it's testable. Walk through your approach.

The function reads a file, parses it, computes a metric, and prints, all tangled together. The move interviewers want is not prettier code, it's pulling pure logic out from side effects so each piece can be tested in isolation.

Updated Aug 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.

The function reads a file, parses it, computes a metric, and prints, all tangled together. The move interviewers want is not prettier code, it's pulling pure logic out from side effects so each piece can be tested in isolation.

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