foldl' (flip ($))
Just a quick Haskell pattern for you.
flip ($)) :: Foldable t => a -> t (a -> a) -> afoldl' (
It’s a handy gadget if you ever need to quickly compose a bunch of endomorphisms (sorry, values of type
a -> a) and thread a value through them. This may smell like the Endo newtype, given the sweet monoid perfume you may have noticed.
Arguably a bit more legibly/conveniently, there’s this thing:
foldr (.) id :: Foldable t => t (b -> b) -> b -> b
You may find use for this with other functions like
foldM. If anybody has an idea for a good name for these, I’m all ears. I’m sure people have been using this for a good long while, after all…