Monads/Maybe monad: Difference between revisions

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 {{out}}
 <pre>
--> 6
+-> 6 True 6
--> 9
+-> 9 True 9
-none -> none
+none -> none True none
--> 12
+-> 12 True 12
-none -> none
+none -> none True none
-none -> none
+none -> none True none
 True
 </pre>