Combinators that allow for a more functional/monadic style of Arrow programming
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If you program with Arrows you have two choices: Use the plain Arrow combinators, that are cumbersome to use, or use special Arrow syntax, that is built into all Haskell compilers and is still not very functional programming style. The arrow syntax still forces you to introduce temporary names, that you would not need in a functional notation.
Where you would write things like
mix <<< (id &&& delay) <<< lowpass
using plain Arrow combinators, you can now write
lowpass >>>= \x -> mix <<< (listen x &&& (delay <<< listen x))
(>>>=) resembles the monadic bind
and allows you for shared access to an arrow result.
Thus it can be used like a