Are they the same?

are-they-the-same/index.js

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+// https://www.codewars.com/kata/are-they-the-same/train/javascript
+
+function comp(a1, a2) {
+  if (!a2) return false;
+  for (let i = 0; i < a1.length; ++i) {
+    let n = a1[i] * a1[i];
+    let idx = a2.indexOf(n);
+    if (idx < 0) return false;
+    a2.splice(idx, 1);
+  }
+  return (a2 || []).length === 0;
+}