[swift-evolution] [Discussion] Sortable Attribute

[Silvan Mosberger]

> I'd be in favor. We'd need another name, since the current closure predicate is already standardized to `by:`.

Haskell uses "on" for sorting with a mapping. There are both

sortOn :: Ord b => (a -> b) -> [a] -> [a]

and

sortBy :: (a -> a -> Ordering) -> [a] -> [a]

in Haskell.
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