A recursive Fibonacci Sequence generator

fib.js

const fib = (count, result = [0, 1]) => {
  if (count <= 2 || count === 0) {
    return result;
  }
  const { length } = result;
  return fib(count - 1, result.concat(result[length - 1] + result[length - 2]));
};

const fib5 = fib(5) // [0, 1, 1, 2, 3]
const fib10 = fib(10) // [0, 1, 1, 2, 3, 5, 8, 13, 21, 34]