Desugaring Haskell's do-notation into applicative operations

Marlow, S; Peyton-Jones, S; Kmett, E; Mokhov, A

doi:10.1145/2976002.2976007

Desugaring Haskell's do-notation into applicative operations

Lookup NU author(s): Dr Andrey Mokhov

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This is the final published version of a conference proceedings (inc. abstract) that has been published in its final definitive form by ACM, 2016.

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Abstract

Monads have taken the world by storm, and are supported by do-notation (at least in Haskell). Programmers are increasingly waking up to the usefulness and ubiquity of Applicatives, but they have so far been hampered by the absence of supporting notation. In this paper we show how to re-use the very same do-notation to work for Applicatives as well, providing efficiency benefits for some types that are both Monad and Applicative, and syntactic convenience for those that are merely Applicative. The result is fully implemented in GHC, and is in use at Facebook to make it easy to write highly-parallel queries in a distributed system.