challenge-algorithms-v2.0-marcela-mathias/04-fibonacci/index.js

export function fibonacci(value) {
  if (value == 0) return 0;
  let firstValue = 0;
  let secondValue = 1;
  for (let i = 2; i <= value; i++) {
    let newValue = firstValue;
    firstValue = secondValue;
    secondValue += newValue;
  }
  return secondValue;
}