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\renewcommand{\slidecaption}{PEP (Scala) 03, King's College London}

\begin{document}

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\begin{frame}[t]

\frametitle{%

  \begin{tabular}{@ {}c@ {}}

  \\[5mm]

  \huge PEP Scala (3) 

  \end{tabular}}

  \normalsize

  \begin{center}

  \begin{tabular}{ll}

  Email:  & christian.urban at kcl.ac.uk\\

  Office: & S1.27 (1st floor Strand Building)\\

  Slides \& Code: & KEATS

  \end{tabular}

  \end{center}

\end{frame}

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\begin{frame}[c, fragile]

\frametitle{The Joy of Immutability}

\begin{itemize}

\item If you need to manipulate some data in a list say, then you make

  a new list with the updated values, rather than revise the original

  list. Easy!\medskip

  {\small

  \begin{lstlisting}[language=Scala, numbers=none, xleftmargin=-1mm]

    val old_list = List(1, 2, 3, 5)

    val new_list = 0 :: old_list

  \end{lstlisting}}  

\item You do not have to be defensive about who can access the data

  (concurrency, lazyness).

\end{itemize}  

\end{frame}

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\begin{frame}[t]

\frametitle{Email: Hate 'val'}

\mbox{}\\[-25mm]\mbox{}

\begin{center}

  \begin{bubble}[10.5cm]

  Subject: \textbf{Hate '\textbf{\texttt{val}}'}\hfill 01:00 AM\medskip\\

  Hello Mr Urban,\medskip\\

  I just wanted to ask, how are we suppose to work

  with the completely useless \textbf{\texttt{val}}, that can’t be changed ever? Why is

  this rule active at all? I’ve spent 4 hours not thinking on the

  coursework, but how to bypass this annoying rule. What’s the whole

  point of all these coursework, when we can’t use everything Scala

  gives us?!?\medskip\\

  Regards.\\

  \mbox{}\hspace{5mm}\textcolor{black!50}{<<deleted>>}\\

  \end{bubble}

\end{center}

\end{frame}

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\begin{frame}[c]

\mbox{}\\[-25mm]\mbox{}

\begin{center}

  \begin{bubble}[10.5cm]

  Subject: \textbf{Re: Hate '\textbf{\texttt{val}}'}\hfill 01:02 AM\bigskip\bigskip\\

  \textcolor{black!70}{

    \textit{\large<<my usual rant about fp\ldots\\ concurrency bla bla\ldots{} better programs

    yada>>}}\bigskip\bigskip\bigskip

  PS: What are you trying to do where you desperately want to use \texttt{var}?

  \end{bubble}

\end{center}

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\begin{frame}[c,fragile]

\begin{textblock}{6}(0.5,0.5)

\begin{bubble}[11.5cm]

  \small  

  Subject: \textbf{Re: Re: Hate '\textbf{\texttt{val}}'}\hfill 01:04 AM\medskip\\

  \textbf{Right now my is\_legal function works fine:}

\footnotesize\begin{lstlisting}[language=Scala, numbers=none, xleftmargin=-1mm]

 def is_legal(dim: Int, path: Path)(x: Pos): Boolean = {

   var boolReturn = false

   if(x._1 > dim || x._2 > dim || x._1 < 0 || x._2 < 0) {

   else { var breakLoop = false

          if(path == Nil) { boolReturn = true }

          else { for(i <- 0 until path.length) {

                    if(breakLoop == false) {

                      if(path(i) == x) {

                        boolReturn = true

                        breakLoop = true

                      }

                      else { boolReturn = false }

                    } else breakLoop

            }

          }

          boolReturn

   }

\end{lstlisting}

\end{bubble}

\end{textblock}

\begin{textblock}{6}(8.2,11.8)

\begin{bubble}[5.5cm]\footnotesize\bf

\ldots{}but I can’t make it work with boolReturn being val. What approach would

you recommend in this case, and is using var in this case justified?

\end{bubble}

\end{textblock}

\only<2>{

\begin{textblock}{6}(0.3,11.8)

  \begin{bubble}[3.1cm]

    \textbf{Me:} \includegraphics[scale=0.08, valign=t]{../pics/throwup.jpg}

  \end{bubble}

\end{textblock}}

\end{frame}

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\begin{frame}[t,fragile]

\mbox{}\\[-25mm]\mbox{}

\begin{textblock}{6}(0.5,2)

  \begin{bubble}[11.5cm]

  Subject: \textbf{Re: Re: Re: Hate '\textbf{\texttt{val}}'}\hfill 01:06 AM\bigskip\\

  \small

  OK. So you want to make sure that the \texttt{x}-position is not outside the

  board....and furthermore you want to make sure that the \texttt{x}-position

  is not yet in the path list. How about something like\bigskip

\footnotesize\begin{lstlisting}[language=Scala, numbers=none, xleftmargin=-1mm]

 def is_legal(dim: Int, path: Path)(x: Pos): Boolean = 

 ...<<some board conditions>>... && !path.contains(x)

\end{lstlisting}\bigskip

  \small Does not even contain a \texttt{val}.

  \end{bubble}

\end{textblock}

\begin{textblock}{6}(7,12)

\footnotesize\textcolor{black!50}{(This is all on one line)}

\end{textblock}

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\begin{frame}[t,fragile]

\mbox{}\\[-15mm]\mbox{}

\begin{textblock}{6}(1,3)

  \begin{bubble}[10.5cm]

    Subject: \textbf{Re: Re: Re: Re: Hate '\textbf{\texttt{val}}'}\hfill 11:02 AM\bigskip\bigskip\\

    THANK YOU! You made me change my coding perspective. Because of you,

    I figured out the next one\ldots

  \end{bubble}

\end{textblock}

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\begin{frame}[c]

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\frametitle{Where to go on from here?}

\begin{itemize}

\item Martin Odersky (EPFL)\ldots he is currently throwing out everything

  and starts again with the dotty compiler for Scala\medskip

\item Elm (\url{http://elm-lang.org})\ldots web applications with style\medskip   

\end{itemize}  

\end{frame}

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\begin{frame}[c]

\frametitle{\begin{tabular}{c}\\[3cm]\alert{Questions?}\end{tabular}}

\mbox{}\footnotesize

Thanks: ``\it{}By the way -  Scala is really getting quite fun

when you start to get the hang of it\ldots''

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