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Talk:Haskell Quiz/Bytecode Compiler/Solution Justin Bailey

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eval (Statement op left right)
        | op == Mult = eval left * eval right
        | op == Minus = eval left - eval right
        | op == Plus = eval left + eval right
        | op == Div = eval left `div` eval right
        | op == Pow = eval left ^ eval right
        | op == Mod = eval left `mod` eval right

Maybe better written as:

eval (Statement op left right) = eval left `f` eval right
    where f Mult  = (*)
          f Minus = (-)
          f Plus  = (+)
          f Div   = div
          f Pow   = (^)
          f Mod   = mod