Determine if a string has all unique characters: Difference between revisions

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@@ Line 1,355: / Line 1,355: @@
         c, indices = charPosns
         return (
-            Just((c, indices)) if sofar['Nothing'] else (
+            maybe(Just((c, indices)))(
-                # Earlier ?
+                lambda kxs: Just((c, indices)) if (
-                Just((c, indices)) if (
+                    # Earlier duplication ?
-                    indices[0] < sofar['Just'][1][0]
+                    indices[0] < kxs[1][0]
                 ) else sofar
-            )
+            )(sofar)
         ) if 1 < len(indices) else sofar