Cheryl's birthday: Difference between revisions

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@@ Line 2,123: / Line 2,123: @@
        of (Month, Day) pairs.
     '''
-    return lambda f: list(f(
+    return lambda f: f(
+        (
-        (dictFromPairs(xs), dictFromPairs(map(swap, xs)))
+            dictFromPairs(xs),
-    ))
+            dictFromPairs(
+                [(b, a) for (a, b) in xs]
+            )
+        )
+    )
@@ Line 2,167: / Line 2,172: @@
     '''
     return tpl[1]
-# swap :: (a, b) -> (b, a)
-def swap(tpl):
-    '''Swapped components of a pair.
-    '''
-    return (tpl[1], tpl[0])