lambda-placeholders: A library to emulate laceholders similar to Scala.

[ bsd3, language, library ] [ Propose Tags ]

A description of the workings of placeholders in Scala can be found here:

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License BSD-3-Clause
Author Matthew Mirman
Category Language
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Source repo head: git clone git://
Uploaded by MatthewMirman at Thu May 29 00:54:49 UTC 2014
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lambda-placeholders is a Haskell library to emulate the placeholders feature of Scala.


  • Placeholders in Scala act similar to those used in category theory.
  • Rather than create a lambda or name a function, an underscore is used in place of a parameter and the function is abstracted over that location.
  • This placeholders library doesn't use underscores, rather it leverages similar capabilities found in TupleSections.
  • A description of Scala placeholders can be found here.


module Main where 
import Language.Placeholders

foo (a,b,c) = a + b + c

curried_foo = foo.$.(2, , )

main = do
    putStrLn $ show $ curried_foo 4 5