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+### arrayGcd
+
+Calculates the greatest common denominator (gcd) of an array of numbers.
+
+Use `Array.reduce()` and the `gcd` formula (uses recursion) to calculate the greatest common denominator of an array of numbers.
+
+```js
+const arrayGcd = arr =>{
+  const gcd = (x, y) => !y ? x : gcd(y, x % y);
+  return arr.reduce((a,b) => gcd(a,b));
+}
+// arrayGcd([1,2,3,4,5]) -> 1
+// arrayGcd([4,8,12]) -> 4
+```