libghc-foldl-dev - 1.4.6-1+b2 main

This library provides strict left folds that stream in constant
memory, and you can combine folds using Applicative style to derive
new folds. Derived folds still traverse the container just once and
are often as efficient as hand-written folds.
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This package provides a library for the Haskell programming language.
See http://www.haskell.org/ for more information on Haskell.