Budget Calculator.

Twelfth class — Foundations finale. You combine remaining and status into a tiny budget API.

function remaining(income, expense) { return income - expense; }

function budgetStatus(income, expense) { const left = remaining(income, expense); if (left > 0) return "ok"; // ... }

The harness will call remaining(3000, 1200) and budgetStatus(3000, 1200). Expect 1800 and status "ok".

Common mistake: printing the status but not returning it — the checker reads the return value.