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---
name: implement-is-odd
description: Implement isOdd following test-driven development
---
# Implement isOdd (test-driven)
Implement `isOdd(n)` in `src/isodd.js` as a named ESM export. It returns whether
an integer is odd.
Follow test-driven development, in this order:
1. **First** write a failing test in `test/isodd.test.js`.
2. **Then** implement `src/isodd.js` to make the test pass.
Do not write the implementation before the test exists and fails.
