Hollow array

hollow-array/index.js

@@ -0,0 +1,19 @@
+// https://www.codewars.com/kata/hollow-array/train/javascript
+
+function isHollow(x) {
+  do {
+    if (x.length < 3) return false;
+    let f = x.shift();
+    let l = x.pop();
+    if (f === 0 && l === 0) {
+      return 0 < x.length && isZeros(x);
+    }
+    if (f === 0 || l === 0) {
+      return false;
+    }
+  } while (1);
+}
+
+function isZeros(x) {
+  return x.every(n => n === 0);
+}