Longest common prefix: Difference between revisions

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@@ Line 1,901: / Line 1,901: @@
     // allSame :: [a] -> Bool
     const allSame = xs =>
+        // True if xs is empty, or every item in the
+        // tail of the list is identical to the head.
 === xs.length || (() => {
-            const x = xs[0];
+            const [h, ...t] = xs;
-            return xs.every(y => x === y);
+            return t.every(x => h === x);
         })();