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"Monoids" is outdated #49

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Pi-Cla opened this issue Mar 3, 2023 · 1 comment
Open

"Monoids" is outdated #49

Pi-Cla opened this issue Mar 3, 2023 · 1 comment

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@Pi-Cla
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Pi-Cla commented Mar 3, 2023 •
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In: Functors, Applicative Functors and Monoids it described Monoids as having a minimal definition of mempty and mappend. Nowadays one has to define the Semigroup first and then define just mempty to create a Monoid. So people should not manually define mappend anymore. Perhaps a section on Semigroups can be created out of the existing sectiom for Monoids?
@Pi-Cla Pi-Cla mentioned this issue Mar 4, 2023
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@Pi-Cla
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Pi-Cla commented Mar 4, 2023

Also, we should in general replace any mention of mappend with <> since the book mostly uses mappend in infix form anyways and this note in the Prelude docs about GHC supposedly removing mappend in some future release.

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