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Answers and rating deltas for

How do I subtract Maybe values in Haskell? For example, if I want to subtract Just 8 - Just 5 to get

Author Votes Δ
chepner 6 +1.27
leftaroundabout 4 +0.09
Redu 2 -0.21
Will Ness 2 -0.93
Last visited: Sep 5, 2020, 12:36:14 PM