slides/slides01.tex
author Christian Urban <urbanc@in.tum.de>
Fri, 22 Jun 2018 13:34:05 +0100
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\documentclass[dvipsnames,14pt,t,xelatex]{beamer}
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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) 01, 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 (1) 
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  \end{tabular}}
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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}[c]
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\frametitle{Why Scala?}
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\begin{textblock}{6}(3,4)
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\begin{tabular}{l}
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\mbox{}\hspace{-1mm}\includegraphics[scale=0.36]{../pics/twitter.png}\\[-1mm]
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\includegraphics[scale=0.30]{../pics/linked.png}\\
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\includegraphics[scale=0.30]{../pics/guardian.jpg}\\[-3mm]
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\mbox{}\hspace{-2mm}\includegraphics[scale=0.38]{../pics/morgan.png}\\[-3mm]
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\includegraphics[scale=0.30]{../pics/suisse.png}\\
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{\large\bf ...}
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\end{tabular}
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\end{textblock}
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\begin{textblock}{6}(9,4)
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\begin{tabular}{l}
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\includegraphics[scale=0.20]{../pics/edf.png}\\[-1mm]
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\includegraphics[scale=0.08]{../pics/novell.png}\\[-1mm]
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\includegraphics[scale=0.30]{../pics/foursquare.png}\\
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\includegraphics[scale=0.30]{../pics/hsbc.png}\\
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{\large\bf ...}
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\end{tabular}
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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{Why Scala?}
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In the last few years there is  a ``Cambrian explosion'' of
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languages from both academia and industry.
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It is essential for students to have skills to pick up new languages
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quickly.
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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{Why Scala?}
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\begin{itemize}
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\item compiles to the JVM\\
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  \textcolor{gray}{(also JavaScript, native X86 in the works)}\medskip
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\item integrates seamlessly with Java\medskip
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\item combines \underline{\bf functional} and {\bf object-oriented} programming\bigskip
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\item it is a bit on the ``mathematical'' side\\
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  \textcolor{gray}{(no pointers, no \texttt{null})}
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\item often one can write very concise and elegant code
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\end{itemize}\bigskip\medskip  
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\small
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alternatives:\\
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Elm, Haskell, Ocaml, F$\sharp$, Erlang, ML, Lisp (Racket), \ldots
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\end{frame}
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\begin{frame}[c]
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\frametitle{Java vs Scala}
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{\lstset{language=java}\fontsize{12}{12}\selectfont
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\texttt{\lstinputlisting{Point.java}}}
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\rule{11cm}{0.3mm}\\[-2mm]
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{\lstset{language=scala}\fontsize{12}{12}\selectfont
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\texttt{\lstinputlisting{Point.scala}}}
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\begin{textblock}{6}(13,3)
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\textbf{\large Java}
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\end{textblock}
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\begin{textblock}{6}(13,13.4)
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\textbf{\large Scala}
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\end{textblock}  
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\end{frame}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
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\begin{frame}[c]
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\frametitle{Scala (imperative) vs Scala (functional)}
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Reham's example
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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{First Steps: Scala Tools}
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\begin{itemize}
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\item there is a plugin for Eclipse (called Scala IDE)\medskip
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\item there is also a plugin for IntelliJ\medskip
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\item there is a worksheet mode in Eclipse and IntelliJ\bigskip
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\item I use Sublime or venerable Emacs ;o)
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\end{itemize}  
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\end{frame}
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\begin{frame}[c]
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  \frametitle{\bf
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  \only<1>{\begin{tabular}{l}\\[2mm]Why Scala?\\ \mbox{}\end{tabular}}
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  \only<2->{\begin{tabular}{l}\\[2mm]Why Functional\\ Programming?\end{tabular}}
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}
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  %
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  \mbox{}\\[3.5cm]
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  \small
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Scala, Elm, Haskell, Ocaml, F$\sharp$, Erlang, ML, Lisp (Racket), \ldots 
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\only<3>{
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\begin{textblock}{6}(2,6.2)
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\begin{bubble}[10cm]
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\normalsize``If you want to see which features will be in mainstream programming
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  languages tomorrow, then take a look at functional programming
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  languages today.''\medskip\small\\
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  \hfill{}---Simon Peyton Jones (works at Microsoft)\\
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  \hfill{}main developer of the Glasgow Haskell Compiler
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\end{bubble}
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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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\mbox{}\\[-21mm]\mbox{}  
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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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  \onslide<1-10>{                
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  \node (A) at (0,0) [node]
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     {\mbox{\includegraphics[scale=0.15]{../pics/cplus2.jpg}}};
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  \node [above right] at (A.north west) {1986};}
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  \onslide<2->{
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  \node (B) at (3.5,0) [node]
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     {\mbox{\includegraphics[scale=0.15]{../pics/robotron.jpg}}};
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  \node [above right] at (B.north west) {1988, C};
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  \draw [->,line width=4mm] (A) -- (B);}
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  \onslide<3->{
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  \node (C0) at (6.3,0) {};
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  \node (C) at (8,0)  [node]
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     {\mbox{\includegraphics[scale=0.15]{../pics/sun.jpg}}};
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  \node [above right] at (C.north west) {1992, {\small Linux}};
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  \draw [->,line width=4mm] (B) -- (C0);
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  \draw [->,line width=4mm] (C0) -- (C);}
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  \onslide<4->{
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  \node (D) at (8,-3.3)  [node]
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     {\mbox{\includegraphics[scale=0.2]{../pics/gateway.jpg}}};
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  \draw [->,line width=4mm] (C) -- (D);
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  \node [below right] at (D.south west) {1996};}
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  \onslide<5->{
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  \node (E) at (4,-3.3)  [node]
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     {\mbox{\includegraphics[scale=0.1]{../pics/appleg4.jpg}}};
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  \draw [->,line width=4mm] (D) -- (E);
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  \node [above right] at (E.north west) {2000};}   
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  \onslide<6->{
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  \node (F0) at (1.5,-3.3) {};
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  \node (F1) at (1,-3.3) {};
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  \node (F) at (-0.9,-3.3)  [node]
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     {\mbox{\includegraphics[scale=0.3]{../pics/appleair.png}}};
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  \draw [->,line width=4mm] (E) -- (F0);
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  \draw [->,line width=4mm] (F1) -- (F);   
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  \node [above right] at (F.north west) {2012?};}   
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  \onslide<7->{
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  \node (G) at (-0.9,-6.3)  [node]
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     {\mbox{\includegraphics[scale=0.02]{../pics/applepro.jpg}}};
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  \draw [->,line width=4mm] (F) -- (G);
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  \node [right] at (G.west) {\hspace{22mm}2017};}   
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  \end{tikzpicture}
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  \end{center}
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  \only<1>{%  
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    \begin{textblock}{10}(2.5,5)  
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      \includegraphics[scale=0.26]{../pics/cplus1.jpg}\\
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      \footnotesize 64K RAM, no HD, no monitor, lots of cables
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    \end{textblock}
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    \begin{textblock}{6}(10.9,4.5)  
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      \includegraphics[scale=0.09]{../pics/mand1.png}
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      \includegraphics[scale=0.09]{../pics/mand2.png}
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    \end{textblock}
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    \begin{textblock}{6}(10.8,2.2)  
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    \huge\bf 3 days
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    \end{textblock}
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  }
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  \only<8->{%
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  \begin{textblock}{8}(5.8,11.6)  
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    \large\bf
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    \begin{tabular}{l@{}l}
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      1986:\, & no Internet\\
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            & no Amazon\\
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            & no FB, no mobiles,\ldots\\ 
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    \end{tabular}         
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    \end{textblock}
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  }
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  \only<9>{
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  \begin{textblock}{1}(3,3)
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    \begin{bubble}[9cm]  
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      \begin{tabular}{@{\hspace{8mm}}llll@{\hspace{8mm}}}
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        \\
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      \multicolumn{4}{c}{\bf Speedup by Moore's Law}\medskip\\
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      \textbf{1986:} & 3 days    & \textbf{1996:} & 135 mins\\
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      \textbf{1988:} & 1.5 days  & \textbf{1998:} & 67 mins\\
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      \textbf{1990:} & 18 hs     & \textbf{2000:} & 33 mins\\
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      \textbf{1992:} & 9 hs      & \textbf{2002:} & 16 mins\\
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      \textbf{1994:} & 4.5 hs    & \multicolumn{2}{c}{???}\\                    
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      \\
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      \end{tabular}
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      \small Every two years, computers got twice as powerful.
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  \end{bubble}
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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{Seq vs Par}
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\begin{center}
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  \begin{tabular}[t]{@{}l@{}l@{}}
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    \includegraphics[scale=0.14]{../pics/mand4.png} &
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    \raisebox{1.2mm}{\includegraphics[scale=0.14]{../pics/mand3.png}}      
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  \end{tabular}     
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\end{center}  
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\only<2>{
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  \begin{textblock}{5}(12,2)
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    \begin{bubble}[2.1cm]
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      \footnotesize{}in Java or C++\\
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      \includegraphics[scale=0.50]{../pics/skeleton.jpg}\\
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    \end{bubble}  
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  \end{textblock}}
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\only<3>{
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  \begin{textblock}{14.2}(1,12.3)
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    In FP: Once a variable is created, it is assigned a value and then
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    never changed again $\Rightarrow$ no synchronisation\smallskip\\
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    \small\textcolor{gray}{(Andrew's second favourite feature of C++)}
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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{Types}
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\begin{itemize}
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\item Base types\smallskip
23
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  \begin{tabular}{@{}l@{}}
23
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    \textcolor{codegreen}{\texttt{Int}},
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    \textcolor{codegreen}{\texttt{Long}},
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    \textcolor{codegreen}{\texttt{BigInt}},
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    \textcolor{codegreen}{\texttt{Float}},
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    \textcolor{codegreen}{\texttt{Double}}\\
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    \textcolor{codegreen}{\texttt{String}},
25
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    \textcolor{codegreen}{\texttt{Char}}\\
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   342
    \textcolor{codegreen}{\texttt{Boolean}}
23
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   343
  \end{tabular}
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\item Compound types \smallskip   
23
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   346
33
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   347
  \begin{tabular}{@{}ll@{}}
23
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   348
    \textcolor{codegreen}{\texttt{List[Int]}}     & lists of Int's \\
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   349
    \textcolor{codegreen}{\texttt{Set[Double]}}   & sets of Double's \\
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   350
    \textcolor{codegreen}{\texttt{(Int, String)}} & Int-String pair\\
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   351
    \textcolor{codegreen}{\texttt{List[(BigInt, String)]}} &
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                                      lists of BigInt-String\\
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   353
                                      & pairs\\
26
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   354
    \textcolor{codegreen}{\texttt{List[List[Int]]}} & list of lists of Int's\\                                  
23
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   355
  \end{tabular}
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\end{itemize}  
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\end{frame}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
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32
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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   363
\begin{frame}[c]
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   364
\frametitle{An Http Request}
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   365
  
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\begin{textblock}{1}(2,5)
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   367
\begin{tabular}{c}
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\includegraphics[scale=0.15]{../pics/servers.png}\\[-2mm]
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\small Server
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   370
\end{tabular}
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   371
\end{textblock}
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   372
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\begin{textblock}{1}(5.6,4)
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  \begin{tikzpicture}[scale=1.1]
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  \draw[white] (0,1) node (X) {};
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   376
  \draw[white] (2,1) node (Y) {};
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   377
   \draw[white] (0,0) node (X1) {};
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   378
  \draw[white] (2,0) node (Y1) {};
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   379
   \draw[white] (0,-1) node (X2) {};
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   380
  \draw[white] (2,-1) node (Y2) {};
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diff changeset
   381
  \draw[red, <-, line width = 2mm] (X) -- (Y);
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diff changeset
   382
  \node [inner sep=5pt,label=above:\textcolor{black}{GET request}] at ($ (X)!.5!(Y) $) {};
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diff changeset
   383
  \draw[red, ->, line width = 2mm] (X1) -- (Y1);
45557ad18ea6 updated
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parents: 26
diff changeset
   384
  \node [inner sep=5pt,label=above:\textcolor{black}{webpage}] at ($ (X1)!.5!(Y1) $) {};
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parents: 26
diff changeset
   385
  \draw[red, <-, line width = 2mm] (X2) -- (Y2);
45557ad18ea6 updated
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parents: 26
diff changeset
   386
  \node [inner sep=7pt,label=above:\textcolor{black}{POST data}] at ($ (X2)!.5!(Y2) $) {};
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parents: 26
diff changeset
   387
  \end{tikzpicture}
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parents: 26
diff changeset
   388
\end{textblock}
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parents: 26
diff changeset
   389
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Christian Urban <urbanc@in.tum.de>
parents: 26
diff changeset
   390
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parents: 26
diff changeset
   391
\begin{textblock}{1}(9,5.5)
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parents: 26
diff changeset
   392
\begin{tabular}{c}
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parents: 26
diff changeset
   393
\includegraphics[scale=0.15]{../pics/laptop.png}\\[-2mm]
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parents: 26
diff changeset
   394
\small Browser
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parents: 26
diff changeset
   395
\end{tabular}
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parents: 26
diff changeset
   396
\end{textblock}
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parents: 26
diff changeset
   397
\end{frame}
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parents: 26
diff changeset
   398
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
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   399
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   400
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
45557ad18ea6 updated
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parents: 26
diff changeset
   401
\begin{frame}[c]
45557ad18ea6 updated
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parents: 26
diff changeset
   402
45557ad18ea6 updated
Christian Urban <urbanc@in.tum.de>
parents: 26
diff changeset
   403
{\lstset{language=Java}\fontsize{7}{8}\selectfont
45557ad18ea6 updated
Christian Urban <urbanc@in.tum.de>
parents: 26
diff changeset
   404
\texttt{\lstinputlisting{URLReader.java}}}
45557ad18ea6 updated
Christian Urban <urbanc@in.tum.de>
parents: 26
diff changeset
   405
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Christian Urban <urbanc@in.tum.de>
parents: 26
diff changeset
   406
\end{frame}
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   407
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
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parents: 26
diff changeset
   408
33
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   409
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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parents: 32
diff changeset
   410
\begin{frame}[c]
140
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diff changeset
   411
\frametitle{Coursework}
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diff changeset
   412
ecec79b9ab25 updated
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parents: 137
diff changeset
   413
\begin{itemize}
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   414
\item sorry, I might have been a bit wordy:\\
ecec79b9ab25 updated
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parents: 137
diff changeset
   415
  CW description is 7 pages, but
142
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parents: 141
diff changeset
   416
  I only needed \mbox{< 150} loc for all the CW\bigskip
140
ecec79b9ab25 updated
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parents: 137
diff changeset
   417
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   418
\item there is email feedback when pushing code to github\bigskip
ecec79b9ab25 updated
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parents: 137
diff changeset
   419
ecec79b9ab25 updated
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diff changeset
   420
\item we want you to learn FP: \alert{no vars}, no mutable
ecec79b9ab25 updated
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parents: 137
diff changeset
   421
  datastructures, e.g.~\texttt{ListBuffer}
ecec79b9ab25 updated
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parents: 137
diff changeset
   422
\end{itemize}
ecec79b9ab25 updated
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parents: 137
diff changeset
   423
\end{frame}
ecec79b9ab25 updated
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diff changeset
   424
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
ecec79b9ab25 updated
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parents: 137
diff changeset
   425
ecec79b9ab25 updated
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parents: 137
diff changeset
   426
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     
ecec79b9ab25 updated
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parents: 137
diff changeset
   427
ecec79b9ab25 updated
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parents: 137
diff changeset
   428
\begin{frame}[c, fragile]
ecec79b9ab25 updated
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parents: 137
diff changeset
   429
\frametitle{The Joy of Immutability}
ecec79b9ab25 updated
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parents: 137
diff changeset
   430
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   431
\begin{itemize}
ecec79b9ab25 updated
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parents: 137
diff changeset
   432
\item If you need to manipulate some data in a list say, then you make
ecec79b9ab25 updated
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parents: 137
diff changeset
   433
  a new list with the updated values, rather than revise the original
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   434
  list. Easy!\medskip
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   435
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   436
  {\small
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   437
  \begin{lstlisting}[language=Scala, numbers=none, xleftmargin=-1mm]
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   438
    val old_list = List(1, 2, 3, 5)
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   439
    val new_list = 0 :: old_list
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   440
  \end{lstlisting}}  
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   441
  
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   442
\item You do not have to be defensive about who can access the data
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   443
  (concurrency, lazyness).
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   444
\end{itemize}  
ecec79b9ab25 updated
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parents: 137
diff changeset
   445
\end{frame}
ecec79b9ab25 updated
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parents: 137
diff changeset
   446
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   447
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   448
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
ecec79b9ab25 updated
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parents: 137
diff changeset
   449
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parents: 137
diff changeset
   450
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   451
\begin{frame}[t]
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   452
\frametitle{Email: Hate 'val'}
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   453
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   454
\mbox{}\\[-25mm]\mbox{}
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   455
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   456
\begin{center}
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   457
  \begin{bubble}[10.5cm]
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   458
  Subject: \textbf{Hate '\textbf{\texttt{val}}'}\hfill 01:00 AM\medskip\\
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   459
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   460
  Hello Mr Urban,\medskip\\
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   461
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   462
  I just wanted to ask, how are we suppose to work
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   463
  with the completely useless \textbf{\texttt{val}}, that can’t be changed ever? Why is
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   464
  this rule active at all? I’ve spent 4 hours not thinking on the
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   465
  coursework, but how to bypass this annoying rule. What’s the whole
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   466
  point of all these coursework, when we can’t use everything Scala
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   467
  gives us?!?\medskip\\
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   468
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   469
  Regards.\\
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   470
  \mbox{}\hspace{5mm}\textcolor{black!50}{<<deleted>>}\\
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   471
  \end{bubble}
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   472
\end{center}
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   473
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   474
\end{frame}
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   475
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     
ecec79b9ab25 updated
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parents: 137
diff changeset
   476
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   477
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   478
\begin{frame}[c]
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   479
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   480
\mbox{}\\[-25mm]\mbox{}
ecec79b9ab25 updated
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parents: 137
diff changeset
   481
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   482
\begin{center}
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   483
  \begin{bubble}[10.5cm]
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   484
  Subject: \textbf{Re: Hate '\textbf{\texttt{val}}'}\hfill 01:02 AM\bigskip\bigskip\\
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   485
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   486
  \textcolor{black!70}{
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   487
    \textit{\large<<my usual rant about fp\ldots\\ concurrency bla bla\ldots{} better programs
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   488
    yada>>}}\bigskip\bigskip\bigskip
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   489
  
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   490
  PS: What are you trying to do where you desperately want to use \texttt{var}?
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   491
  \end{bubble}
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   492
\end{center}
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parents: 137
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   494
\end{frame}
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   495
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     
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parents: 137
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   497
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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parents: 137
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   498
\begin{frame}[c,fragile]
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parents: 137
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   499
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parents: 137
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   500
\begin{textblock}{6}(0.5,0.5)
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   501
\begin{bubble}[11.5cm]
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parents: 137
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   502
  \small  
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parents: 137
diff changeset
   503
  Subject: \textbf{Re: Re: Hate '\textbf{\texttt{val}}'}\hfill 01:04 AM\medskip\\
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   504
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   505
  \textbf{Right now my is\_legal function works fine:}
ecec79b9ab25 updated
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parents: 137
diff changeset
   506
  
ecec79b9ab25 updated
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parents: 137
diff changeset
   507
\footnotesize\begin{lstlisting}[language=Scala, numbers=none, xleftmargin=-1mm]
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parents: 137
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   508
 def is_legal(dim: Int, path: Path)(x: Pos): Boolean = {
ecec79b9ab25 updated
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parents: 137
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   509
   var boolReturn = false
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   510
   if(x._1 > dim || x._2 > dim || x._1 < 0 || x._2 < 0) {
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Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   511
   else { var breakLoop = false
ecec79b9ab25 updated
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parents: 137
diff changeset
   512
          if(path == Nil) { boolReturn = true }
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parents: 137
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   513
          else { for(i <- 0 until path.length) {
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parents: 137
diff changeset
   514
                    if(breakLoop == false) {
ecec79b9ab25 updated
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diff changeset
   515
                      if(path(i) == x) {
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   516
                        boolReturn = true
ecec79b9ab25 updated
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parents: 137
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   517
                        breakLoop = true
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parents: 137
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   518
                      }
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   519
                      else { boolReturn = false }
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parents: 137
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   520
                    } else breakLoop
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   521
            }
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parents: 137
diff changeset
   522
          }
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parents: 137
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   523
          boolReturn
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parents: 137
diff changeset
   524
   }
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parents: 137
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   525
\end{lstlisting}
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parents: 137
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   526
\end{bubble}
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parents: 137
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   527
\end{textblock}
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parents: 137
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   528
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parents: 137
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   529
\begin{textblock}{6}(8.2,11.8)
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parents: 137
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   530
\begin{bubble}[5.5cm]\footnotesize\bf
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   531
\ldots{}but I can’t make it work with boolReturn being val. What approach would
ecec79b9ab25 updated
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parents: 137
diff changeset
   532
you recommend in this case, and is using var in this case justified?
ecec79b9ab25 updated
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parents: 137
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   533
\end{bubble}
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   534
\end{textblock}
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parents: 137
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   535
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parents: 137
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   536
\only<2>{
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parents: 137
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   537
\begin{textblock}{6}(0.3,11.8)
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   538
  \begin{bubble}[3.1cm]
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parents: 137
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   539
    \textbf{Me:}
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parents: 137
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   540
    \raisebox{-12mm}{\includegraphics[scale=0.08]{../pics/throwup.jpg}}
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  \end{bubble}
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parents: 137
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   542
\end{textblock}}
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parents: 137
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   543
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parents: 137
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   544
\end{frame}
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parents: 137
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   545
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
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   546
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parents: 137
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   547
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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   548
\begin{frame}[t,fragile]
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   549
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   550
\mbox{}\\[-25mm]\mbox{}
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parents: 137
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   551
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parents: 137
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   552
\begin{textblock}{6}(0.5,2)
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   553
  \begin{bubble}[11.5cm]
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parents: 137
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   554
  Subject: \textbf{Re: Re: Re: Hate '\textbf{\texttt{val}}'}\hfill 01:06 AM\bigskip\\
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   555
  \small
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   556
  
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   557
  OK. So you want to make sure that the \texttt{x}-position is not outside the
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   558
  board....and furthermore you want to make sure that the \texttt{x}-position
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   559
  is not yet in the path list. How about something like\bigskip
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   560
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   561
\footnotesize\begin{lstlisting}[language=Scala, numbers=none, xleftmargin=-1mm]
ecec79b9ab25 updated
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parents: 137
diff changeset
   562
 def is_legal(dim: Int, path: Path)(x: Pos): Boolean = 
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   563
   ...<<some board conditions>>... && !path.contains(x)
ecec79b9ab25 updated
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parents: 137
diff changeset
   564
\end{lstlisting}\bigskip
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   565
  
ecec79b9ab25 updated
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parents: 137
diff changeset
   566
  \small Does not even contain a \texttt{val}.
ecec79b9ab25 updated
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parents: 137
diff changeset
   567
  \end{bubble}
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parents: 137
diff changeset
   568
\end{textblock}
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parents: 137
diff changeset
   569
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parents: 137
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   570
\begin{textblock}{6}(7,12)
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   571
\footnotesize\textcolor{black!50}{(This is all on one line)}
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parents: 137
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   572
\end{textblock}
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parents: 137
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   573
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parents: 137
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   574
\end{frame}
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parents: 137
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   575
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     
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   576
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parents: 137
diff changeset
   577
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parents: 137
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   578
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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   579
\begin{frame}[t,fragile]
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parents: 137
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   580
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Christian Urban <urbanc@in.tum.de>
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   581
\mbox{}\\[-15mm]\mbox{}
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parents: 137
diff changeset
   582
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Christian Urban <urbanc@in.tum.de>
parents: 137
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   583
\begin{textblock}{6}(1,3)
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parents: 137
diff changeset
   584
  \begin{bubble}[10.5cm]
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parents: 137
diff changeset
   585
    Subject: \textbf{Re: Re: Re: Re: Hate '\textbf{\texttt{val}}'}\hfill 11:02 AM\bigskip\bigskip\\
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   586
    
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   587
    THANK YOU! You made me change my coding perspective. Because of you,
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   588
    I figured out the next one\ldots
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   589
  \end{bubble}
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   590
\end{textblock}
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   591
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   592
\only<2>{
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   593
\begin{textblock}{6}(0.3,11.8)
ecec79b9ab25 updated
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parents: 137
diff changeset
   594
  \begin{bubble}[3.1cm]
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parents: 137
diff changeset
   595
    \textbf{Me:}
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   596
    \raisebox{-12mm}{\includegraphics[scale=0.15]{../pics/happy.jpg}}
ecec79b9ab25 updated
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parents: 137
diff changeset
   597
  \end{bubble}
ecec79b9ab25 updated
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parents: 137
diff changeset
   598
\end{textblock}}
ecec79b9ab25 updated
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parents: 137
diff changeset
   599
ecec79b9ab25 updated
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parents: 137
diff changeset
   600
\end{frame}
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parents: 137
diff changeset
   601
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
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parents: 137
diff changeset
   602
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   603
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   604
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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parents: 137
diff changeset
   605
\begin{frame}[c]
33
b6cb302633eb updated
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parents: 32
diff changeset
   606
\frametitle{Conclusion}
b6cb302633eb updated
Christian Urban <urbanc@in.tum.de>
parents: 32
diff changeset
   607
b6cb302633eb updated
Christian Urban <urbanc@in.tum.de>
parents: 32
diff changeset
   608
\begin{itemize}
b6cb302633eb updated
Christian Urban <urbanc@in.tum.de>
parents: 32
diff changeset
   609
\item Scala is still under heavy development\\ (the compiler is terribly slow)\medskip
b6cb302633eb updated
Christian Urban <urbanc@in.tum.de>
parents: 32
diff changeset
   610
\item {\bf\url{http://www.scala-lang.org/}}\bigskip
140
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   611
  
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   612
\item it is a rather \textbf{\alert{deep}} language\ldots i.e.~gives
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   613
  you a lot of rope to shoot yourself\bigskip
33
b6cb302633eb updated
Christian Urban <urbanc@in.tum.de>
parents: 32
diff changeset
   614
140
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   615
\item learning functional programming is not easy\ldots{}when you have
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   616
  spent all of your career thinking in a procedural way it is hard to
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   617
  change\bigskip\medskip
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   618
  
33
b6cb302633eb updated
Christian Urban <urbanc@in.tum.de>
parents: 32
diff changeset
   619
\item hope you have fun with the coursework  
b6cb302633eb updated
Christian Urban <urbanc@in.tum.de>
parents: 32
diff changeset
   620
\end{itemize}
b6cb302633eb updated
Christian Urban <urbanc@in.tum.de>
parents: 32
diff changeset
   621
\end{frame}
b6cb302633eb updated
Christian Urban <urbanc@in.tum.de>
parents: 32
diff changeset
   622
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
b6cb302633eb updated
Christian Urban <urbanc@in.tum.de>
parents: 32
diff changeset
   623
b6cb302633eb updated
Christian Urban <urbanc@in.tum.de>
parents: 32
diff changeset
   624
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
b6cb302633eb updated
Christian Urban <urbanc@in.tum.de>
parents: 32
diff changeset
   625
\begin{frame}[c]
140
ecec79b9ab25 updated
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parents: 137
diff changeset
   626
\frametitle{\begin{tabular}{c}\\[0cm]\alert{Questions?}\end{tabular}}
33
b6cb302633eb updated
Christian Urban <urbanc@in.tum.de>
parents: 32
diff changeset
   627
140
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   628
\begin{center}
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   629
  \begin{tabular}[t]{@{}l@{}l@{}}
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   630
    \includegraphics[scale=0.1]{../pics/mand4.png} &
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   631
    \raisebox{1.2mm}{\includegraphics[scale=0.1]{../pics/mand3.png}}      
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   632
  \end{tabular}     
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   633
\end{center}
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   634
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   635
\begin{center}
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   636
My Scala Office Hours: Thursdays 11 -- 13
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   637
\end{center}
33
b6cb302633eb updated
Christian Urban <urbanc@in.tum.de>
parents: 32
diff changeset
   638
\end{frame}
b6cb302633eb updated
Christian Urban <urbanc@in.tum.de>
parents: 32
diff changeset
   639
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
b6cb302633eb updated
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parents: 32
diff changeset
   640
\end{document}
32
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diff changeset
   641
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diff changeset
   642
22
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Christian Urban <urbanc@in.tum.de>
parents:
diff changeset
   643
\end{document}
9830203b058d updated
Christian Urban <urbanc@in.tum.de>
parents:
diff changeset
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9830203b058d updated
Christian Urban <urbanc@in.tum.de>
parents:
diff changeset
   645
%%% Local Variables:  
9830203b058d updated
Christian Urban <urbanc@in.tum.de>
parents:
diff changeset
   646
%%% mode: latex
9830203b058d updated
Christian Urban <urbanc@in.tum.de>
parents:
diff changeset
   647
%%% TeX-master: t
9830203b058d updated
Christian Urban <urbanc@in.tum.de>
parents:
diff changeset
   648
%%% End: 
9830203b058d updated
Christian Urban <urbanc@in.tum.de>
parents:
diff changeset
   649
140
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Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   650
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   651
“Functional programming is often regarded as the best-kept secret of
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   652
scientific modelers, mathematicians, artificial intelligence
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   653
researchers, financial institutions, graphic designers, CPU designers,
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   654
compiler programmers, and telecommunications engineers.”
ecec79b9ab25 updated
Christian Urban <urbanc@in.tum.de>
parents: 137
diff changeset
   655
ecec79b9ab25 updated
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parents: 137
diff changeset
   656
The Wikipedia F# page