### 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.

```js
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));
};
```

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