hasufell/haskell-lectures
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Reorder for improved clarity

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Julian Ospald 2015-04-16 01:31:15 +02:00
parent 8852f5d465
commit 81170661bc
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1 changed files with 9 additions and 10 deletions
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VL1.tex
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@ -501,16 +501,6 @@ data MaybeInt = NoError Int
| Error String | Error String
\end{lstlisting} \end{lstlisting}
\pause \pause
And now we can do sanity checks:
\pause
\setHaskellCodeStyle
\begin{lstlisting}
calcSomething :: Int -> MaybeInt
calcSomething x
| x < 100 = NoError (x * 5)
| otherwise = Error "Int out of range!"
\end{lstlisting}
\pause
So constructors are just \emph{functions}! And they can have arguments, just like functions. Let's check their types: So constructors are just \emph{functions}! And they can have arguments, just like functions. Let's check their types:
\setHaskellCodeStyle \setHaskellCodeStyle
\begin{lstlisting} \begin{lstlisting}
@ -519,6 +509,15 @@ NoError :: Int -> MaybeInt
> :t Error > :t Error
Error :: String -> MaybeInt Error :: String -> MaybeInt
\end{lstlisting} \end{lstlisting}
\pause
And now we can do sanity checks:
\setHaskellCodeStyle
\begin{lstlisting}
calcSomething :: Int -> MaybeInt
calcSomething x
| x < 100 = NoError (x * 5)
| otherwise = Error "Int out of range!"
\end{lstlisting}
\end{frame} \end{frame}
\begin{frame}[fragile] \begin{frame}[fragile]