tulkdan.dev
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:sparkles: added let in example on haskell functions
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Haskell/Functions.org
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Haskell/Functions.org
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#+RESULTS:
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: (1.0,-2.5)
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** Clausula "let in"
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Ela eh bem semelhando a clausula ~where~, porem o escopo das definicoes declaradas soh sao acessadas dentro do escopo do ~in~.
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#+begin_src haskell
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:{
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cylinder :: (RealFloat a) => a -> a -> a
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cylinder r h =
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let sideArea = 2 * pi * r * h
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topArea = pi * r ^2
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in sideArea + 2 * topArea
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:}
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cylinder 2 5
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#+end_src
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#+RESULTS:
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: Prelude> 87.96459430051421
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Tambem eh possivel declarar funcoes dentro do escopo do ~let~
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#+begin_src haskell
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[let square x = x * x in (square 5, square 3, square 2)]
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#+end_src
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#+RESULTS: