From 97f6b18ca6e3a1ea1e8b30ff64111d619cd4e030 Mon Sep 17 00:00:00 2001
From: gkucmierz <gkucmierz@gmail.com>
Date: Sun, 17 Sep 2017 20:09:12 +0200
Subject: [PATCH] Hollow array

---
 hollow-array/index.js | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 hollow-array/index.js

diff --git a/hollow-array/index.js b/hollow-array/index.js
new file mode 100644
index 0000000..e1c8390
--- /dev/null
+++ b/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);
+}
\ No newline at end of file