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.
YOU MAY ALSO LIKE:
- Well-Typed's Fast Track to Haskell (in London on 3rd - 4th October 2016)
- Well-Typed's Guide to the Haskell Type System (in London on 5th October 2016)
- Haskell eXchange 2016 (in London on 6th - 7th October 2016)
- Well-Typed's Guide to Haskell Performance and Optimization (in London on 10th - 11th October 2016)
Lazy I/O and Alternatives in Haskell
Edsko joined Well-Typed as a Haskell Consultant in 2012. He is one of the primary authors of Cloud Haskell and has recently been working on Haskell language infrastructure.Edsko has been using Haskell since 2004, and holds a PhD in substructural type