\documentclass[dvipsnames,14pt,t,xelatex]{beamer}+
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\usepackage{chessboard}+
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\usepackage[LSBC4,T1]{fontenc}+
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\usepackage{../slides}+
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\usepackage{../graphics}+
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\usepackage{../langs}+
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% \usepackage{../data}+
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\hfuzz=220pt +
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%\setmonofont[Scale=.88]{Consolas}+
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%\newfontfamily{\consolas}{Consolas}+
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\lstset{language=Scala,+
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        style=mystyle,+
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        numbersep=0pt,+
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        numbers=none,+
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        xleftmargin=0mm}+
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\newcommand{\bl}[1]{\textcolor{blue}{#1}}     +
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% beamer stuff +
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\renewcommand{\slidecaption}{PEP (Scala) 02, King's College London}+
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\begin{document}+
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%+
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\begin{frame}[t]+
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\frametitle{%+
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  \begin{tabular}{@ {}c@ {}}+
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  \\[5mm]+
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  \huge PEP Scala (2) +
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  \end{tabular}}+
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+
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  \normalsize+
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  \begin{center}+
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  \begin{tabular}{ll}+
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    Email:  & christian.urban at kcl.ac.uk\\+
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    Office: & N7.07 (North Wing, Bush House)\\+
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    Slides \& Code: & KEATS\medskip\\+
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    Scala Office & \\+
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    Hours: &  Thursdays 11 -- 13\\+
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  \end{tabular}+
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  \end{center}+
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\end{frame}+
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     +
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     +
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\begin{frame}[t,fragile]+
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  \frametitle{Mea Culpa}+
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\bigskip+
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  +
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\mbox{\hspace{-4mm}}CW6, Part 3 (deadline 21 December)\bigskip\medskip  +
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\small+
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\begin{lstlisting}[language=Scala, numbers=none, xleftmargin=-4mm]+
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val blchip_portfolio =+
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 List("GOOG", "AAPL", "MSFT", "IBM", "FB",+
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                          "YHOO", "AMZN", "BIDU")+
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+
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val rstate_portfolio =+
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List("PLD", "PSA", "AMT", "AIV", "AVB",+
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                          "BXP", "CBG", "CCI", +
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     "DLR", "EQIX", "EQR", "ESS", "EXR",+
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                          "FRT", "GGP", "HCP") +
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\end{lstlisting}\bigskip+
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                        +
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\onslide<2>{The results in the CW are calculated with YHOO and CBG deleted.}+
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\only<2>{+
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\begin{textblock}{6}(8.5,6.6)+
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  \begin{tikzpicture}+
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    \node (B0) at (0,0) {};+
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    \node (B1) at (0,0.5) {};+
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    \node (B2) at (1.2,0) {};+
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    \draw [red,line width=1mm] (B0) -- (B3);+
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    \draw [red,line width=1mm] (B1) -- (B2);+
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  \end{tikzpicture}+
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\end{textblock}}+
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\only<2>{+
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\begin{textblock}{6}(10.5,9.9)+
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    \draw [red,line width=1mm] (B0) -- (B3);+
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\end{textblock}}+
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\end{frame}+
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%+
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     +
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\begin{frame}[c]+
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\frametitle{Mea Culpa 2}+
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+
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Avoid at all costs, even in comments+
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+
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\begin{itemize}+
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\item \texttt{var} \only<2>{$\quad\Rightarrow\;$\texttt{Var}}+
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\item \texttt{return} \only<2>{$\quad\Rightarrow\;$\texttt{Return}}+
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\item \texttt{.par}+
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\item \texttt{ListBuffer}+
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\item \texttt{mutable}  +
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\end{itemize}+
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\end{frame}+
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%+
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     +
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\begin{frame}[t]+
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\frametitle{For-Comprehensions Again}+
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\begin{center}+
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  \begin{tikzpicture}[scale=1,+
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                      node/.style={+
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                      rectangle,rounded corners=3mm,+
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                      very thick,draw=black!50,+
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                      minimum height=18mm, minimum width=20mm,+
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                      top color=white,bottom color=black!20}]+
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  \node (A0) at (0.1,0) {\texttt{\textcolor{purple}{\textbf{for}} (\alert<2->{n} <- List(}};+
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  \node (A1) at (2.3,0) {\texttt{\phantom{,}1,}};+
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  \node (A2) at (3.2,0) {\texttt{\phantom{,}2,}};+
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  \node (A3) at (4.1,0) {\texttt{\phantom{,}3,}};+
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  \node (A4) at (5.0,0) {\texttt{\phantom{,}4,}};+
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  \node (A5) at (5.9,0) {\texttt{\phantom{))}5))}};+
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  \node (A6) at (8,0) {\texttt{\textcolor{purple}{\textbf{yield}} \alert<2->{n\,*\,n}}};+
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  \onslide<2->{+
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  \node (B0) at (1.4,-3) {\texttt{List(}};+
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  \node (B1) at (2.3,-3) {\texttt{\phantom{,}1,}};+
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  \node (B2) at (3.6,-3) {\texttt{\phantom{,}4,}};+
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  \node (B3) at (4.9,-3) {\texttt{\phantom{,}9,}};+
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  \node (B4) at (6.2,-3) {\texttt{\phantom{,}16,}};+
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  \node (B5) at (7.5,-3) {\texttt{\phantom{,}25)}};}+
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  \onslide<2->{+
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  \draw [->,line width=1mm] (A1.south) -- (B1.north);+
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  \onslide<2->{+
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  \node (Q1) at (-0.45,-0.1) {};+
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  \node (Q2) at (-0.45,-2.8) {};+
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  \node (Q3) at (-0.45,-2.95) {\alert<2->{\texttt{n\,*\,n:}}};+
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  \draw [->,red,line width=1mm] (Q1.south) -- (Q2.north);}+
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 \end{tikzpicture}+
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\end{center}+
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\onslide<3>{This is for when the for-comprehension\\ \textbf{yields / produces} a result.}+
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\end{frame}+
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\begin{frame}[t]+
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\frametitle{For-Comprehensions Again}+
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\begin{center}+
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  \begin{tikzpicture}[scale=1,+
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                      node/.style={+
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                      rectangle,rounded corners=3mm,+
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                      very thick,draw=black!50,+
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                      minimum height=18mm, minimum width=20mm,+
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                      top color=white,bottom color=black!20}]+
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  \node (A0) at (0,0)+
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    {\texttt{\textcolor{purple}{\textbf{for}} (n <- List(1, 2, 3, 4, 5))+
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             \textcolor{purple}{\textbf{yield}} n\,*\,n}};+
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  \node (A1) at (0,-1.5) {\LARGE\textbf{vs}};       +
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         +
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  \node (A2) at (0,-3)+
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    {\texttt{\textcolor{purple}{\textbf{for}} (n <- List(1, 2, 3, 4, 5)) println(n)}};+
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 \end{tikzpicture}+
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\end{center}\bigskip+
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The second version is in case the for \textbf{does not}+
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produce any result.+
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\end{frame}+
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%+
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     +
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\begin{frame}[t]+
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\frametitle{Why Scala? No null!}+
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\begin{itemize}+
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\item \large {\bf You can avoid \textcolor{blue}{\texttt{null}}}:+
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\end{itemize}+
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\begin{textblock}{6}(1,5)+
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  \begin{bubble}[10.5cm]\small+
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      ``I call it my billion-dollar mistake. It was the invention of+
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      the null reference in 1965. At that time, I was designing the+
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      first comprehensive type system for references in an object+
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      oriented language (ALGOL W). My goal was to ensure that all use+
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      of references should be absolutely safe, with checking performed+
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      automatically by the compiler. But I couldn't resist the+
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      temptation to put in a null reference, simply because it was so+
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      easy to implement. This has led to innumerable errors,+
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      vulnerabilities, and system crashes, which have probably caused+
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      a billion dollars of pain and damage in the last forty years.''+
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      \hfill Sir Tony (Hoare)+
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\end{bubble}+
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\end{textblock}+
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\begin{textblock}{5}(12.5,1.9)+
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\includegraphics[scale=0.05]{../pics/hoare.jpg}\\+
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\end{frame}+
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%+
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%+
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\begin{frame}[c,fragile]+
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\frametitle{\begin{tabular}{c}\\[1cm]\alert{Questions?}\end{tabular}}+
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\begin{center}+
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\chessboard[maxfield=g7,+
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            color=blue!50,+
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            linewidth=0.2em,+
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            shortenstart=0.5ex,+
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            markstyle=cross,+
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            markfields={a4, c4, Z3, d3, Z1, d1, a0, c0},+
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            color=red!50,+
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            markfields={f5, e6},+
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            boardfontsize=12pt,labelfontsize=8pt,+
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            setpieces={Ng7, Nb2},showmover=false]+
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\end{center}+
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            +
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\begin{center}+
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My Scala Office Hours: Thursdays 11 -- 13+
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\end{center}+
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\end{frame}+
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   +
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\end{document}+
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\end{document}+
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%%% Local Variables:  +
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%%% End: +
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