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\lstset{language=Scala,
        style=mystyle,
        numbersep=0pt,
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\newcommand{\bl}[1]{\textcolor{blue}{#1}}     

% beamer stuff 
\renewcommand{\slidecaption}{PEP (Scala) 01, King's College London}


\begin{document}

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\begin{frame}[t]
\frametitle{%
  \begin{tabular}{@ {}c@ {}}
  \\[5mm]
  \huge PEP Scala (1) 
  \end{tabular}}

  \normalsize
  \begin{center}
  \begin{tabular}{ll}
    Email:  & christian.urban at kcl.ac.uk\\
    Office: & N7.07 (North Wing, Bush House)\\
    Slides \& Code: & KEATS\medskip\\
    Scala Office & \\
    Hours: &  Thursdays 11 -- 13\\
  \end{tabular}
  \end{center}


\end{frame}
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\begin{frame}[c]
\frametitle{Why Scala?}

\begin{textblock}{6}(3,4)
\begin{tabular}{l}
\mbox{}\hspace{-1mm}\includegraphics[scale=0.36]{../pics/twitter.png}\\[-1mm]
\includegraphics[scale=0.30]{../pics/linked.png}\\
\includegraphics[scale=0.30]{../pics/guardian.jpg}\\[-3mm]
\mbox{}\hspace{-2mm}\includegraphics[scale=0.38]{../pics/morgan.png}\\[-3mm]
\includegraphics[scale=0.30]{../pics/suisse.png}\\
{\large\bf ...}
\end{tabular}
\end{textblock}

\begin{textblock}{6}(9,4)
\begin{tabular}{l}
\includegraphics[scale=0.20]{../pics/edf.png}\\[-1mm]
\includegraphics[scale=0.08]{../pics/novell.png}\\[-1mm]
\includegraphics[scale=0.30]{../pics/foursquare.png}\\
\includegraphics[scale=0.30]{../pics/hsbc.png}\\
{\large\bf ...}
\end{tabular}
\end{textblock}

\end{frame}
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\begin{frame}[c]
\frametitle{Why Scala?}

\begin{itemize}
\item compiles to the JVM\\
  \textcolor{gray}{(also JavaScript, native X86 in the works)}\medskip
\item integrates seamlessly with Java\medskip
\item combines \underline{\bf functional} and {\bf object-oriented} programming\bigskip
\item it is a bit on the ``mathematical'' side\\
  \textcolor{gray}{(no pointers, no \texttt{null})}
  
\item often one can write very concise and elegant code
\end{itemize}\bigskip\medskip  

\small
alternatives:\\
Elm, Haskell, Ocaml, F\sharp, Erlang, ML, Lisp (Racket), \ldots

\end{frame}
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\begin{frame}[c]
\frametitle{Java vs Scala}

{\lstset{language=java}\fontsize{12}{12}\selectfont
\texttt{\lstinputlisting{Point.java}}}

\rule{11cm}{0.3mm}\\[-2mm]

{\lstset{language=scala}\fontsize{12}{12}\selectfont
\texttt{\lstinputlisting{Point.scala}}}

\begin{textblock}{6}(13,3)
\textbf{\large Java}
\end{textblock}



\begin{textblock}{6}(13,13.4)
\textbf{\large Scala}
\end{textblock}  

\end{frame}
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\begin{frame}[c]
\frametitle{First Steps: Scala Tools}

\begin{itemize}
\item there is a plugin for Eclipse (called Scala IDE)\medskip
\item there is also a plugin for IntelliJ\medskip
\item there is a worksheet mode in Eclipse and IntelliJ\bigskip
\item I use Sublime or venerable Emacs ;o)
\end{itemize}  

\end{frame}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}[c]
  \frametitle{\bf
  \only<1>{\begin{tabular}{l}\\[2mm]Why Scala?\\ \mbox{}\end{tabular}}
  \only<2->{\begin{tabular}{l}\\[2mm]Why Functional\\ Programming?\end{tabular}}
}


  %
  \mbox{}\\[3.5cm]
  \small
Scala, Elm, Haskell, Ocaml, F\sharp, Erlang, ML, Lisp (Racket), \ldots 

\only<3>{
\begin{textblock}{6}(2,6.2)
\begin{bubble}[10cm]
\normalsize``If you want to see which features will be in mainstream programming
  languages tomorrow, then take a look at functional programming
  languages today.''\medskip\small\\
  \hfill{}---Simon Peyton Jones (works at Microsoft)\\
  \hfill{}main developer of the Glasgow Haskell Compiler
\end{bubble}
\end{textblock}}

\end{frame}
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\begin{frame}[c]
\mbox{}\\[-21mm]\mbox{}  

\begin{center}
  \begin{tikzpicture}[scale=1,
                      node/.style={
                      rectangle,rounded corners=3mm,
                      very thick,draw=black!50,
                      minimum height=18mm, minimum width=20mm,
                      top color=white,bottom color=black!20}]

  \onslide<1-10>{                
  \node (A) at (0,0) [node]
     {\mbox{\includegraphics[scale=0.15]{../pics/cplus2.jpg}}};
  \node [above right] at (A.north west) {1986};}

  \onslide<2->{
  \node (B) at (3.5,0) [node]
     {\mbox{\includegraphics[scale=0.15]{../pics/robotron.jpg}}};
  \node [above right] at (B.north west) {1988, C};
  \draw [->,line width=4mm] (A) -- (B);}

  \onslide<3->{
  \node (C0) at (6.3,0) {};
  \node (C) at (8,0)  [node]
     {\mbox{\includegraphics[scale=0.15]{../pics/sun.jpg}}};
  \node [above right] at (C.north west) {1992, {\small Linux}};
  \draw [->,line width=4mm] (B) -- (C0);
  \draw [->,line width=4mm] (C0) -- (C);}

  \onslide<4->{
  \node (D) at (8,-3.3)  [node]
     {\mbox{\includegraphics[scale=0.2]{../pics/gateway.jpg}}};
  \draw [->,line width=4mm] (C) -- (D);
  \node [below right] at (D.south west) {1996};}

  \onslide<5->{
  \node (E) at (4,-3.3)  [node]
     {\mbox{\includegraphics[scale=0.1]{../pics/appleg4.jpg}}};
  \draw [->,line width=4mm] (D) -- (E);
  \node [above right] at (E.north west) {2000};}   

  \onslide<6->{
  \node (F0) at (1.5,-3.3) {};
  \node (F1) at (1,-3.3) {};
  \node (F) at (-0.9,-3.3)  [node]
     {\mbox{\includegraphics[scale=0.3]{../pics/appleair.png}}};
  \draw [->,line width=4mm] (E) -- (F0);
  \draw [->,line width=4mm] (F1) -- (F);   
  \node [above right] at (F.north west) {2012?};}   

  \onslide<7->{
  \node (G) at (-0.9,-6.3)  [node]
     {\mbox{\includegraphics[scale=0.02]{../pics/applepro.jpg}}};
  \draw [->,line width=4mm] (F) -- (G);
  \node [right] at (G.west) {\hspace{22mm}2017};}   
  
  \end{tikzpicture}
  \end{center}


  \only<1>{%  
    \begin{textblock}{10}(2.5,5)  
      \includegraphics[scale=0.26]{../pics/cplus1.jpg}\\
      \footnotesize 64K RAM, no HD, no monitor, lots of cables
    \end{textblock}
    \begin{textblock}{6}(10.9,4.5)  
      \includegraphics[scale=0.09]{../pics/mand1.png}
      \includegraphics[scale=0.09]{../pics/mand2.png}
    \end{textblock}
    \begin{textblock}{6}(10.8,2.2)  
    \huge\bf 3 days
    \end{textblock}
  }
  \only<8->{%
  \begin{textblock}{8}(5.8,11.6)  
    \large\bf
    \begin{tabular}{l@{}l}
      1986:\, & no Internet\\
            & no Amazon\\
            & no FB, no mobiles,\ldots\\ 
    \end{tabular}         
    \end{textblock}
  }
  \only<9>{
  \begin{textblock}{1}(3,3)
    \begin{bubble}[9cm]  
      \begin{tabular}{@{\hspace{8mm}}llll@{\hspace{8mm}}}
        \\
      \multicolumn{4}{c}{\bf Speedup by Moore's Law}\medskip\\
      \textbf{1986:} & 3 days    & \textbf{1996:} & 135 mins\\
      \textbf{1988:} & 1.5 days  & \textbf{1998:} & 67 mins\\
      \textbf{1990:} & 18 hs     & \textbf{2000:} & 33 mins\\
      \textbf{1992:} & 9 hs      & \textbf{2002:} & 16 mins\\
      \textbf{1994:} & 4.5 hs    & \multicolumn{2}{c}{???}\\                    
      \\
      \end{tabular}
      \small Every two years, computers got twice as powerful.
  \end{bubble}
  \end{textblock}}

\end{frame}
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\begin{frame}[c]
\frametitle{Seq vs Par}

\begin{center}
  \begin{tabular}[t]{@{}l@{}l@{}}
    \includegraphics[scale=0.14]{../pics/mand4.png} &
    \raisebox{1.2mm}{\includegraphics[scale=0.14]{../pics/mand3.png}}      
  \end{tabular}     
\end{center}  

\only<2>{
  \begin{textblock}{5}(12,2)
    \begin{bubble}[2.1cm]
      \footnotesize{}in Java or C++\\
      \includegraphics[scale=0.50]{../pics/skeleton.jpg}\\
    \end{bubble}  
  \end{textblock}}

\only<3>{
  \begin{textblock}{5}(1,8)
    \begin{bubble}[2.1cm]
      \footnotesize{}in Java or C++\\
    \end{bubble}  
  \end{textblock}}

\end{frame}
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\begin{frame}[c]
\frametitle{Types}

\begin{itemize}
\item Base types\smallskip

  \begin{tabular}{@{}l@{}}
    \textcolor{codegreen}{\texttt{Int}},
    \textcolor{codegreen}{\texttt{Long}},
    \textcolor{codegreen}{\texttt{BigInt}},
    \textcolor{codegreen}{\texttt{Float}},
    \textcolor{codegreen}{\texttt{Double}}\\
    \textcolor{codegreen}{\texttt{String}},
    \textcolor{codegreen}{\texttt{Char}}\\
    \textcolor{codegreen}{\texttt{Boolean}}
  \end{tabular}

\item Compound types \smallskip   

  \begin{tabular}{@{}ll@{}}
    \textcolor{codegreen}{\texttt{List[Int]}}     & lists of Int's \\
    \textcolor{codegreen}{\texttt{Set[Double]}}   & sets of Double's \\
    \textcolor{codegreen}{\texttt{(Int, String)}} & Int-String pair\\
    \textcolor{codegreen}{\texttt{List[(BigInt, String)]}} &
                                      lists of BigInt-String\\
                                      & pairs\\
    \textcolor{codegreen}{\texttt{List[List[Int]]}} & list of lists of Int's\\                                  
  \end{tabular}

\end{itemize}  

\end{frame}
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\begin{frame}[c]
\frametitle{An Http Request}
  
\begin{textblock}{1}(2,5)
\begin{tabular}{c}
\includegraphics[scale=0.15]{../pics/servers.png}\\[-2mm]
\small Server
\end{tabular}
\end{textblock}

\begin{textblock}{1}(5.6,4)
  \begin{tikzpicture}[scale=1.1]
  \draw[white] (0,1) node (X) {};
  \draw[white] (2,1) node (Y) {};
   \draw[white] (0,0) node (X1) {};
  \draw[white] (2,0) node (Y1) {};
   \draw[white] (0,-1) node (X2) {};
  \draw[white] (2,-1) node (Y2) {};
  \draw[red, <-, line width = 2mm] (X) -- (Y);
  \node [inner sep=5pt,label=above:\textcolor{black}{GET request}] at ($ (X)!.5!(Y) $) {};
  \draw[red, ->, line width = 2mm] (X1) -- (Y1);
  \node [inner sep=5pt,label=above:\textcolor{black}{webpage}] at ($ (X1)!.5!(Y1) $) {};
  \draw[red, <-, line width = 2mm] (X2) -- (Y2);
  \node [inner sep=7pt,label=above:\textcolor{black}{POST data}] at ($ (X2)!.5!(Y2) $) {};
  \end{tikzpicture}
\end{textblock}


\begin{textblock}{1}(9,5.5)
\begin{tabular}{c}
\includegraphics[scale=0.15]{../pics/laptop.png}\\[-2mm]
\small Browser
\end{tabular}
\end{textblock}
\end{frame}
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\begin{frame}[c]

{\lstset{language=Java}\fontsize{7}{8}\selectfont
\texttt{\lstinputlisting{URLReader.java}}}

\only<2>{
\begin{textblock}{5}(12,2)
\includegraphics[scale=0.50]{../pics/skeleton.jpg}\\
\end{textblock}}
\end{frame}
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\begin{frame}[c]
\frametitle{Conclusion}

\begin{itemize}
\item Scala is still under heavy development\\ (the compiler is terribly slow)\medskip
\item {\bf\url{http://www.scala-lang.org/}}\bigskip
\item it is a rather \textbf{\alert{deep}} language\ldots i.e.~gives you a lot of
  rope to shoot yourself\bigskip\bigskip 

\item hope you have fun with the coursework  
\end{itemize}
\end{frame}
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\begin{frame}[c]
\frametitle{\begin{tabular}{c}\\[3cm]\alert{Questions?}\end{tabular}}

\mbox{}
\end{frame}
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\end{document}


\end{document}

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