CODEWITHSUNDEEP
haskellhaskell-lens
massysett
massysett

Reputation: 1114

Using lens for access to a Data.Sequence.Seq

Is there any way to use lens to get functionality similar to the functions in Data.List? For instance I am thinking of something like

isPrefixOf :: Eq a => Seq a -> Seq a -> Bool
isSuffixOf :: Eq a => Seq a -> Seq a -> Bool

And of course these functions would work on a list, vector, etc. I would think lens could do this sort of thing but from the Haddocks it's not apparent to me.

Upvotes: 0

Views: 114

Answers (1)

danidiaz
danidiaz

Reputation: 27756

This is not a lens-based answer, but the monoid-subclasses package has the RightReductiveMonoid typeclass that offers isSuffixOf, and LeftReductiveMonoid that offers isPrefixOf.

List and Seq (along with many other containers) are instances of those typeclasses.

Upvotes: 4

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