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A functional programming language

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Iterating (mapping) recursive data type in Haskell

So, I'm reading the book "The Haskell School of Expression" to learn myself a bit of Haskell and they have the following type: data Picture = Region Color Region | Picture `Over` Picture … Haskell is packed with abstractions, so I wonder, does it have an abstraction for iterating over recursive data types? …
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