30-seconds-of-code/snippets/arrayLcm.md

arrayLcm

Calculates the lowest common multiple (lcm) of an array of numbers.

Use Array.reduce() and the lcm formula (uses recursion) to calculate the lowest common multiple of an array of numbers.

const arrayLcm = arr => {
  const gcd = (x, y) => (!y ? x : gcd(y, x % y));
  const lcm = (x, y) => x * y / gcd(x, y);
  return arr.reduce((a, b) => lcm(a, b));
};

arrayLcm([1, 2, 3, 4, 5]); // 60
arrayLcm([4, 8, 12]); // 24