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By dotCore
via patrickthomson.ghost.io
Submitted: Mar 18 2014 / 22:08

In 1991, Erik Meijer, Maarten Fokkinga, and Ross Paterson published their now-classic paper Functional Programming with Bananas, Lenses, Envelopes and Barbed Wire. Though this paper isn’t widely known outside of the functional programming community, its contributions are astonishing: the authors use category theory to express a set of simple, composable combinators, called recursion schemes, that automate the process of traversing and recursing through nested data structures. Though recursion schemes predate Meijer et. al’s work, this paper brings the enormous abstractive power of category theory to bear on the subject of traversing data structures—it’s a magnificent example of how category-theoretical concepts can bring both rigor and simplicity to day-to-day programming tasks.
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