Function loop

code/solutions/05_2_your_own_loop.js:1–5

(start, test, update, body)

function loop(start, test, update, body) {
  for (let value = start; test(value); value = update(value)) {
    body(value);
  }
}

loop(3, n => n > 0, n => n - 1, console.log);
// → 3