Lazy I/O is the standard solution to this in the current base libraries, but has its problems. We explain how lazy I/O works, what the problems are, and explore some of the solutions that are being proposed at the moment: iteratees, pipes, stream I/O, etc.
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Lazy I/O and Alternatives in Haskell
Edsko received his PhD in type systems for functional programming languages from Trinity College in 2008. After that he worked as a postdoctoral researcher proving properties of concurrent programs, before joining Well-Typed as a Haskell Consultant in 2012. As a consultant he has worked on many projects, both proprietary and open source, including Cloud Haskell, Sparkle, and the Hackage Security library. He also teaches Haskell around the world and blogs frequently on advanced Haskell programming topics.