const fibonacci = function(count) { if (count < 0) return "OOPS"; if (count === 0) return 0; let firstPrev = 1; let secondPrev = 0; for (let i = 2; i <= count; i++) { let current = firstPrev + secondPrev; secondPrev = firstPrev; firstPrev = current; } return firstPrev; }; module.exports = fibonacci;