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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) \liningnums{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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\hspace{7mm}\huge PEP Scala (\liningnums{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: & N\liningnums{7.07} (North Wing, Bush House)\\
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Slides \& Code: & KEATS\medskip\\
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Office Hours: & Mondays 12:00 -- 14:00\\
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& \alert{except next week: Tuesday}
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\end{tabular}
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\end{center}
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%\tiny
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%developed since 2004 bv Martin Odersky
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%picture about assignments
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\begin{textblock}{6}(0.5,0.5)
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\includegraphics[scale=0.035]{../pics/assign.jpg}\\[-1mm]
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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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\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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\begin{textblock}{6}(2,12)
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\begin{bubble}[9cm]
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\small
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developed since 2004 by Martin Odersky\\
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(he was behind Generic Java which was included in Java 5
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\ldots I am using it maybe since 2008?)
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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{Why Scala?}
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%
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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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%
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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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%
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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}, but expressions)}
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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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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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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}(13,13.6)
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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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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%\begin{frame}[c]
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%\frametitle{Scala (imperative) vs Scala (functional)}
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%
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%Reham's example
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%
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%
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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 I use VS Code and a Scala extension (M'place)
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\begin{center}
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\includegraphics[scale=0.10]{../pics/vscode.png}\\[-10mm]\mbox{}
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\end{center}\bigskip
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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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\end{itemize}
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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{\bf
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\only<1>{\begin{tabular}{l}\\[2mm]Why Scala?\\ \mbox{}\end{tabular}}
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\only<2->{\begin{tabular}{c}\\[2mm]Why Functional\\[-2mm] 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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\only<4>{
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\begin{textblock}{6}(5,5.8)
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\hspace{2mm}\includegraphics[scale=0.06]{../pics/assign.jpg}\\[-1mm]
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\Large\alert{\textbf{Immutability}}
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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, fragile]
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{\Large Why bother? or\smallskip\\\hfill What is wrong with this?}\bigskip\bigskip
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\begin{lstlisting}[language=C,numbers=none]
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for (int i = 10; i < 20; i++) {
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//...Do something interesting
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// with i...
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}
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\end{lstlisting}
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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}{\alert{\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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\includegraphics[scale=0.14]{../pics/mand4.png} & \hspace{4mm}
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\raisebox{0mm}{\includegraphics[scale=0.14]{../pics/mand3.png}}\\
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\hspace{6mm}\includegraphics[scale=0.5]{../pics/cpu2.png} &
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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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\only<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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\begin{itemize}
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\item Base types\smallskip
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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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\item Compound types \smallskip
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\begin{tabular}{@{}ll@{}}
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\textcolor{codegreen}{\texttt{List[Int]}} & lists of Int's \\
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\textcolor{codegreen}{\texttt{Set[Double]}} & sets of Double's \\
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\textcolor{codegreen}{\texttt{(Int, String)}} & Int-String pair\\
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\textcolor{codegreen}{\texttt{List[(BigInt, String)]}} &
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lists of BigInt-String\\
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& pairs\\
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\textcolor{codegreen}{\texttt{List[List[Int]]}} & list of lists of Int's\\ \textcolor{codegreen}{\texttt{Option[Int]}} & options of Int's \\
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\end{tabular}
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\end{itemize}
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%\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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%\end{tabular}
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% \draw[white] (0,1) node (X) {};
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% \draw[white] (0,0) node (X1) {};
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% \draw[white] (2,0) node (Y1) {};
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% \draw[white] (0,-1) node (X2) {};
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% \draw[white] (2,-1) node (Y2) {};
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% \draw[red, <-, line width = 2mm] (X) -- (Y);
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% \node [inner sep=5pt,label=above:\textcolor{black}{GET request}] at ($ (X)!.5!(Y) $) {};
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% \draw[red, ->, line width = 2mm] (X1) -- (Y1);
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% \node [inner sep=5pt,label=above:\textcolor{black}{webpage}] at ($ (X1)!.5!(Y1) $) {};
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% \draw[red, <-, line width = 2mm] (X2) -- (Y2);
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% \node [inner sep=7pt,label=above:\textcolor{black}{POST data}] at ($ (X2)!.5!(Y2) $) {};
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%\includegraphics[scale=0.15]{../pics/laptop.png}\\[-2mm]
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%\small Browser
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%\end{tabular}
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%
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%{\lstset{language=Java}\fontsize{7}{8}\selectfont
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%\texttt{\lstinputlisting{URLReader.java}}}
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%
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\begin{itemize}
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\item Sorry, I might have been a bit wordy:\\
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CW description is 7 pages, but
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I only needed \mbox{< 100} loc for \emph{all} the CW6.\bigskip
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\item there is email feedback when pushing code to github\medskip
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\item there are \texttt{jar}-files you can use to test my implementation\bigskip
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470 |
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|
471 |
\item we want you to learn FP: \alert{\bf no vars}, no mutable
|
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472 |
data-structures, e.g.~no \texttt{Arrays}, no \texttt{ListBuffer}
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\end{itemize}
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\end{frame}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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478 |
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\begin{frame}[c, fragile]
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480 |
\frametitle{The Joy of Immutability}
|
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|
481 |
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|
482 |
\begin{itemize}
|
|
|
483 |
\item If you need to manipulate some data in a list say, then you make
|
|
|
484 |
a new list with the updated values, rather than revise the original
|
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|
485 |
list. Easy!\medskip
|
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|
486 |
|
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|
487 |
{\small
|
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|
488 |
\begin{lstlisting}[language=Scala, numbers=none, xleftmargin=-1mm]
|
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|
489 |
val old_list = List(1, 2, 3, 5)
|
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|
490 |
val new_list = 0 :: old_list
|
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|
491 |
\end{lstlisting}}
|
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|
200
|
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\item You do not have to be defensive about who can access the data.
|
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494 |
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|
495 |
\item You can look at your code in isolation.
|
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\end{itemize}
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\end{frame}
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498 |
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500 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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502 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
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|
503 |
\begin{frame}[t]
|
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|
504 |
\frametitle{Email: Hate 'val'}
|
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|
505 |
|
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|
506 |
\mbox{}\\[-25mm]\mbox{}
|
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|
507 |
|
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|
508 |
\begin{center}
|
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|
509 |
\begin{bubble}[10.5cm]
|
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|
510 |
Subject: \textbf{Hate '\textbf{\texttt{val}}'}\hfill 01:00 AM\medskip\\
|
|
|
511 |
|
|
|
512 |
Hello Mr Urban,\medskip\\
|
|
|
513 |
|
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|
514 |
I just wanted to ask, how are we suppose to work
|
|
|
515 |
with the completely useless \textbf{\texttt{val}}, that can’t be changed ever? Why is
|
|
|
516 |
this rule active at all? I’ve spent 4 hours not thinking on the
|
|
|
517 |
coursework, but how to bypass this annoying rule. What’s the whole
|
|
|
518 |
point of all these coursework, when we can’t use everything Scala
|
|
|
519 |
gives us?!?\medskip\\
|
|
|
520 |
|
|
|
521 |
Regards.\\
|
|
|
522 |
\mbox{}\hspace{5mm}\textcolor{black!50}{<<deleted>>}\\
|
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|
523 |
\end{bubble}
|
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|
524 |
\end{center}
|
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525 |
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|
526 |
\end{frame}
|
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|
527 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
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|
528 |
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|
529 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
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|
530 |
\begin{frame}[c]
|
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|
531 |
|
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|
532 |
\mbox{}\\[-25mm]\mbox{}
|
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|
533 |
|
|
|
534 |
\begin{center}
|
|
|
535 |
\begin{bubble}[10.5cm]
|
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|
536 |
Subject: \textbf{Re: Hate '\textbf{\texttt{val}}'}\hfill 01:02 AM\bigskip\bigskip\\
|
|
|
537 |
|
|
|
538 |
\textcolor{black!70}{
|
|
|
539 |
\textit{\large<<my usual rant about fp\ldots\\ concurrency bla bla\ldots{} better programs
|
|
|
540 |
yada>>}}\bigskip\bigskip\bigskip
|
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|
541 |
|
|
|
542 |
PS: What are you trying to do where you desperately want to use \texttt{var}?
|
|
|
543 |
\end{bubble}
|
|
|
544 |
\end{center}
|
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|
545 |
|
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|
546 |
\end{frame}
|
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547 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
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548 |
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|
549 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
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|
550 |
\begin{frame}[c,fragile]
|
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|
551 |
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|
552 |
\begin{textblock}{6}(0.5,0.5)
|
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|
553 |
\begin{bubble}[11.5cm]
|
|
|
554 |
\small
|
|
|
555 |
Subject: \textbf{Re: Re: Hate '\textbf{\texttt{val}}'}\hfill 01:04 AM\medskip\\
|
|
|
556 |
|
|
|
557 |
\textbf{Right now my is\_legal function works fine:}
|
|
|
558 |
|
|
|
559 |
\footnotesize\begin{lstlisting}[language=Scala, numbers=none, xleftmargin=-1mm]
|
|
|
560 |
def is_legal(dim: Int, path: Path)(x: Pos): Boolean = {
|
|
|
561 |
var boolReturn = false
|
|
|
562 |
if(x._1 > dim || x._2 > dim || x._1 < 0 || x._2 < 0) {
|
|
|
563 |
else { var breakLoop = false
|
|
|
564 |
if(path == Nil) { boolReturn = true }
|
|
|
565 |
else { for(i <- 0 until path.length) {
|
|
|
566 |
if(breakLoop == false) {
|
|
|
567 |
if(path(i) == x) {
|
|
|
568 |
boolReturn = true
|
|
|
569 |
breakLoop = true
|
|
|
570 |
}
|
|
|
571 |
else { boolReturn = false }
|
|
|
572 |
} else breakLoop
|
|
|
573 |
}
|
|
|
574 |
}
|
|
|
575 |
boolReturn
|
|
|
576 |
}
|
|
|
577 |
\end{lstlisting}
|
|
|
578 |
\end{bubble}
|
|
|
579 |
\end{textblock}
|
|
|
580 |
|
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|
581 |
\begin{textblock}{6}(8.2,11.8)
|
|
|
582 |
\begin{bubble}[5.5cm]\footnotesize\bf
|
|
|
583 |
\ldots{}but I can’t make it work with boolReturn being val. What approach would
|
|
|
584 |
you recommend in this case, and is using var in this case justified?
|
|
|
585 |
\end{bubble}
|
|
|
586 |
\end{textblock}
|
|
|
587 |
|
|
|
588 |
\only<2>{
|
|
|
589 |
\begin{textblock}{6}(0.3,11.8)
|
|
|
590 |
\begin{bubble}[3.1cm]
|
|
|
591 |
\textbf{Me:}
|
|
|
592 |
\raisebox{-12mm}{\includegraphics[scale=0.08]{../pics/throwup.jpg}}
|
|
|
593 |
\end{bubble}
|
|
|
594 |
\end{textblock}}
|
|
|
595 |
|
|
|
596 |
\end{frame}
|
|
|
597 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
598 |
|
|
|
599 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
600 |
\begin{frame}[t,fragile]
|
|
|
601 |
|
|
|
602 |
\mbox{}\\[-25mm]\mbox{}
|
|
|
603 |
|
|
|
604 |
\begin{textblock}{6}(0.5,2)
|
|
|
605 |
\begin{bubble}[11.5cm]
|
|
|
606 |
Subject: \textbf{Re: Re: Re: Hate '\textbf{\texttt{val}}'}\hfill 01:06 AM\bigskip\\
|
|
|
607 |
\small
|
|
|
608 |
|
|
|
609 |
OK. So you want to make sure that the \texttt{x}-position is not outside the
|
|
|
610 |
board....and furthermore you want to make sure that the \texttt{x}-position
|
|
|
611 |
is not yet in the path list. How about something like\bigskip
|
|
|
612 |
|
|
|
613 |
\footnotesize\begin{lstlisting}[language=Scala, numbers=none, xleftmargin=-1mm]
|
|
|
614 |
def is_legal(dim: Int, path: Path)(x: Pos): Boolean =
|
|
|
615 |
...<<some board conditions>>... && !path.contains(x)
|
|
|
616 |
\end{lstlisting}\bigskip
|
|
|
617 |
|
|
|
618 |
\small Does not even contain a \texttt{val}.
|
|
|
619 |
\end{bubble}
|
|
|
620 |
\end{textblock}
|
|
|
621 |
|
|
|
622 |
\begin{textblock}{6}(7,12)
|
|
|
623 |
\footnotesize\textcolor{black!50}{(This is all on one line)}
|
|
|
624 |
\end{textblock}
|
|
|
625 |
|
|
|
626 |
\end{frame}
|
|
|
627 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
628 |
|
|
|
629 |
|
|
|
630 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
631 |
\begin{frame}[t,fragile]
|
|
|
632 |
|
|
|
633 |
\mbox{}\\[-15mm]\mbox{}
|
|
|
634 |
|
|
|
635 |
\begin{textblock}{6}(1,3)
|
|
|
636 |
\begin{bubble}[10.5cm]
|
|
|
637 |
Subject: \textbf{Re: Re: Re: Re: Hate '\textbf{\texttt{val}}'}\hfill 11:02 AM\bigskip\bigskip\\
|
|
|
638 |
|
|
|
639 |
THANK YOU! You made me change my coding perspective. Because of you,
|
|
|
640 |
I figured out the next one\ldots
|
|
|
641 |
\end{bubble}
|
|
|
642 |
\end{textblock}
|
|
|
643 |
|
|
|
644 |
\only<2>{
|
|
|
645 |
\begin{textblock}{6}(0.3,11.8)
|
|
|
646 |
\begin{bubble}[3.1cm]
|
|
|
647 |
\textbf{Me:}
|
|
|
648 |
\raisebox{-12mm}{\includegraphics[scale=0.15]{../pics/happy.jpg}}
|
|
|
649 |
\end{bubble}
|
|
|
650 |
\end{textblock}}
|
|
|
651 |
|
|
|
652 |
\end{frame}
|
|
|
653 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
654 |
|
|
|
655 |
|
|
|
656 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
657 |
\begin{frame}[c]
|
|
33
|
658 |
\frametitle{Conclusion}
|
|
|
659 |
|
|
|
660 |
\begin{itemize}
|
|
|
661 |
\item Scala is still under heavy development\\ (the compiler is terribly slow)\medskip
|
|
|
662 |
\item {\bf\url{http://www.scala-lang.org/}}\bigskip
|
|
140
|
663 |
|
|
|
664 |
\item it is a rather \textbf{\alert{deep}} language\ldots i.e.~gives
|
|
|
665 |
you a lot of rope to shoot yourself\bigskip
|
|
33
|
666 |
|
|
140
|
667 |
\item learning functional programming is not easy\ldots{}when you have
|
|
200
|
668 |
spent all of your career thinking in an imperative way, it is hard to
|
|
140
|
669 |
change\bigskip\medskip
|
|
|
670 |
|
|
200
|
671 |
\item hope you have fun with Scala and the assignments
|
|
33
|
672 |
\end{itemize}
|
|
|
673 |
\end{frame}
|
|
|
674 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
675 |
|
|
|
676 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
677 |
\begin{frame}[c]
|
|
140
|
678 |
\frametitle{\begin{tabular}{c}\\[0cm]\alert{Questions?}\end{tabular}}
|
|
33
|
679 |
|
|
140
|
680 |
\begin{center}
|
|
|
681 |
\begin{tabular}[t]{@{}l@{}l@{}}
|
|
200
|
682 |
\includegraphics[scale=0.1]{../pics/mand4.png} & \hspace{4mm}
|
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\raisebox{0mm}{\includegraphics[scale=0.1]{../pics/mand3.png}}
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\end{tabular}
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\end{center}
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\begin{center}
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My Office Hours: Mondays 12 -- 14\\
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except next week: Tuesday 12 -- 14
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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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%%% mode: latex
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%%% TeX-master: t
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%%% End:
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“Functional programming is often regarded as the best-kept secret of
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scientific modelers, mathematicians, artificial intelligence
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researchers, financial institutions, graphic designers, CPU designers,
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compiler programmers, and telecommunications engineers.”
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The Wikipedia F# page |