Answer by leftaroundabout for What is exactly an indexed functor in Haskell...
An indexed functor is, to use spacesuitburritoesque wording, “a container that also contains a mapping”. I.e. a value f j k a will “contain” some sort of morphism(s) j -> k(not necessarily...
View ArticleWhat is exactly an indexed functor in Haskell and what are its usages?
When studying functors in Haskell I came up with Functor.Indexed type of functor. This functor defines an operation called imap. I didn't understood its definition and imap signature: imap :: (a ->...
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