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Lecture "Functors and friends" as part of Course:Lambdas in Koblenz

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List processing with maps and folds is generalized to a class of types. In particular, we look at data types that can be thought of as modeling containers, and we treat them in a way similar to lists. This is possible, for example, for maybe types and rose trees. To this end, we leverage the notions of functor and foldable type. The corresponding type classes rely on higher-kinded polymorphism. We exercise maps and folds also in a non-trivial example of bidirectional transformation.

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Ralf Lämmel edited this article at Wed, 17 Jun 2020 12:45:56 +0200
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