In The Brain of Edsko de Vries: Lazy I/O and Alternatives in Haskell

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Haskell is one of the few programming languages that use lazy evaluation: computations get performed only when their result is demanded. It is however not so straightforward to combine lazy evaluation with side effects, such as reading from a file. 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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• Haskell
• functional programming
• Lazy i/o

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