Iteratees at Tsuru Capital

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noreply@blogger.com (Anonymous) — Sun, 18 Sep 2011 09:10:00 +0000

. We use iteratees throughout our systems, and have actively encouraged all our staff to contribute changes upstream and participate in community design discussions. By being part of the open source community and taking part in peer-review, we all end up with better software.

Over time various Tsuru staff members have worked on tools using iteratees, including (grepping the CONTRIBUTORS files): Bryan Buecking, Michael Baikov, Elliott Pace, Conrad Parker, Akio Takano, and Maciej Wos. There's been some lively discussions and many small patches providing functions that we use in production every day.

Last year Conal Elliott provided some mentoring to Tsuru staff, during which we worked through a denotational semantics for iteratees. This resulted in discussions on both the iteratee project list and haskell-cafe about

last (an iteratee that efficiently returns the last element of a stream), mapM_ and foldM.

<). These allow stream converters to be composed without rewriting boilerplate. Jon Lato gives a good example using these in the StackOverflow answer to for using multiple iteratees to process a single stream instance, and (for zip*) collecting the results.

Thanks

Thanks to John Lato for consistently and reliably maintaining the iteratee package, providing thoughtful feedback and graciously suggesting improvements.