Implement a pure function using TDD. Argument: function name and purpose.

1. Write the test file first (`*.test.ts` colocated next to the source file).

PublishedJun 7, 2026

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Implement a pure function using TDD. Argument: function name and purpose.

Write the test file first (*.test.ts colocated next to the source file).
Define test cases covering: happy path, edge cases, error cases.
Run just test — confirm tests fail (red).
Write the minimal implementation to pass tests.
Run just test — confirm tests pass (green).
Refactor if needed, keeping tests green.
Add TSDoc to the exported function.

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