O'Reilly logo

Haskell Design Patterns by Ryan Lemmer

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Scrap your boilerplate

Scrap your boilerplate (SYB) is another early approach to datatype-generic programming, that is, it provides a way to define generic functions over a "universal" type representation.

SYB differs from the other two approaches we have explored in that the type representation is obfuscated from the user.

Earlier versions of the SYB approach had a strong focus on generic traversals over complex nested data structures, for example:

data Book = Book Title [Chapter] data Chapter = Chapter Title [Section] data Section = Section Title [Para] type Title = String; type Para = String haskellDP = Book "Haskell Design Patterns" chapters chapters = [Chapter "The building blocks" sections1, Chapter "IO Patterns" sections2] sections1 = [Section ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required