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% beamer stuff
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\renewcommand{\slidecaption}{PEP (Scala) \liningnums{01}, King's College London}
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% https://insights.stackoverflow.com/survey/2019#technology-most-loved-dreaded-and-wanted
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% processors in the future / Ahmdahl law
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% https://www.youtube.com/watch?v=_9mzmvhwMqw
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\begin{document}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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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)\bigskip\\
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Slides \& Code: & KEATS\bigskip\\
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%Office Hours: & Thursdays 12:00 -- 14:00\\
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%Additionally: & (for Scala) Tuesdays 10:45 -- 11:45\\
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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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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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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}(3,3)
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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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\begin{textblock}{6}(9,3)
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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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\begin{textblock}{12}(2,11)
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\footnotesize
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\begin{mybox3}{A former student working now at Quantexa:}\it
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``I am a former student. I graduated last year. I got my dream job
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as a backend Scala developer. Most of the Scala I know is from PEP
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2018/19. My interviewers said they expect code of a lesser quality
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even from people with one year of experience.''
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\end{mybox3}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%\begin{textblock}{6}(2,12)
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%\begin{bubble}[9.4cm]
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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 Scala since maybe 2008?)
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%\end{bubble}
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%\end{textblock}
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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\medskip
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\item no pointers, no null
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%\item it is a bit on the ``theory'' / ``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}[t]
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\frametitle{Java vs Scala}
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{\lstset{language=java,numbers=right}\fontsize{12}{12}\selectfont
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\texttt{\lstinputlisting{Point.java}}}
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\rule{11cm}{0.3mm}\\[-3mm]
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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}(13,14.3)
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\textbf{\large Scala}
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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 contains a REPL
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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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\begin{frame}[c, fragile]
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\small
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My personal keboard shortcut for VS Code\\
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(in keybindings.json)\bigskip
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\footnotesize
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\begin{lstlisting}[language=json,numbers=none,xrightmargin=-4cm]
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[
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{
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"key": "ctrl+enter",
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"command": "workbench.action.terminal.runSelectedText",
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"when": "editorTextFocus && editorHasSelection"
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}
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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}[t]
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\frametitle{Why Scala?}
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\onslide<2->{%
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\begin{center}
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{\large\bf{}Money?}\bigskip\\
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\begin{tabular}{@{}c@{}c@{}}
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\includegraphics[scale=0.2]{../pics/salary1.png} &
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\includegraphics[scale=0.2]{../pics/salary2.png}\\
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\multicolumn{2}{r@{}}{\footnotesize$^*$ source: Stackoverflow Developer Survey, 2019}
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\end{tabular}
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\end{center}
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\RIGHTarrow{2}{2.0}{6.3}
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}
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\small
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Elm, Rust, Haskell, Ocaml, F$\#$, Erlang, ML, Lisp (Racket)\ldots
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\only<3>{
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\begin{bubble}[6.5cm]
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\bf\huge\textcolor{RoyalBlue}{Functional Programming!}
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\end{textblock}}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\frametitle{\begin{tabular}{c}\\[2mm]
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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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\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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\hspace{2mm}\includegraphics[scale=0.06]{../pics/assign.jpg}\\[-1mm]
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\Large\alert{\hspace{5mm}\textbf{Immutability}}
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\includegraphics[scale=0.4]{../pics/pure.png}
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\begin{textblock}{6}(9,14)
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\tiny$^*$ from ``What pure functional programming is all about?''
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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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\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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|
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\multicolumn{4}{c}{\alert{\bf Speedup by Moore's Law}}\medskip\\
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|
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\textbf{1986:} & 3 days & \textbf{1996:} & 135 mins\\
|
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|
458 |
\textbf{1988:} & 1.5 days & \textbf{1998:} & 67 mins\\
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|
459 |
\textbf{1990:} & 18 hs & \textbf{2000:} & 33 mins\\
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|
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\textbf{1992:} & 9 hs & \textbf{2002:} & 16 mins\\
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|
461 |
\textbf{1994:} & 4.5 hs & \multicolumn{2}{c}{???}\\
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\\
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|
463 |
\end{tabular}
|
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|
464 |
\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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\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} & \hspace{4mm}
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\raisebox{0mm}{\includegraphics[scale=0.14]{../pics/mand3.png}}\\
|
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|
479 |
\hspace{6mm}\includegraphics[scale=0.5]{../pics/cpu2.png} &
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480 |
\hspace{11mm}\includegraphics[scale=0.5]{../pics/cpu1.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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487 |
\footnotesize{}in Java or C++\\
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488 |
\includegraphics[scale=0.50]{../pics/skeleton.jpg}\\
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|
489 |
\end{bubble}
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\end{textblock}}
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491 |
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\only<3>{
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\begin{textblock}{14.2}(1,13.5)
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140
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In FP: Once a variable is created, it is assigned a value and then
|
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308
|
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never changed again $\Rightarrow$ no synchronisation needed\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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354
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%\begin{frame}
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%
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%\begin{frame}[c, fragile]
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%
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%\mbox{}\bigskip\bigskip\bigskip
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510 |
%
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|
511 |
%\begin{lstlisting}[language=Scala,numbers=none]
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|
512 |
%for (y <- (0 until H).par) {
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513 |
% for (x <- (0 until W).par) {
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514 |
%
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515 |
% ...
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516 |
%
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% }
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%}
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%\end{lstlisting}
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%
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%
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%\end{frame}
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\frametitle{Types}
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\begin{itemize}
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33
|
530 |
\item Base types\smallskip
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23
|
531 |
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33
|
532 |
\begin{tabular}{@{}l@{}}
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23
|
533 |
\textcolor{codegreen}{\texttt{Int}},
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534 |
\textcolor{codegreen}{\texttt{Long}},
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535 |
\textcolor{codegreen}{\texttt{BigInt}},
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|
536 |
\textcolor{codegreen}{\texttt{Float}},
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\textcolor{codegreen}{\texttt{Double}}\\
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\textcolor{codegreen}{\texttt{String}},
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25
|
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\textcolor{codegreen}{\texttt{Char}}\\
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|
540 |
\textcolor{codegreen}{\texttt{Boolean}}
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23
|
541 |
\end{tabular}
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542 |
|
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33
|
543 |
\item Compound types \smallskip
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23
|
544 |
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33
|
545 |
\begin{tabular}{@{}ll@{}}
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23
|
546 |
\textcolor{codegreen}{\texttt{List[Int]}} & lists of Int's \\
|
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|
547 |
\textcolor{codegreen}{\texttt{Set[Double]}} & sets of Double's \\
|
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|
548 |
\textcolor{codegreen}{\texttt{(Int, String)}} & Int-String pair\\
|
|
|
549 |
\textcolor{codegreen}{\texttt{List[(BigInt, String)]}} &
|
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|
550 |
lists of BigInt-String\\
|
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|
551 |
& pairs\\
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200
|
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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 \\
|
|
23
|
553 |
\end{tabular}
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|
554 |
|
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|
555 |
\end{itemize}
|
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|
556 |
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|
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\end{frame}
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558 |
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559 |
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32
|
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%\begin{frame}[c]
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|
562 |
%\frametitle{An Http Request}
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32
|
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200
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%\begin{textblock}{1}(2,5)
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|
565 |
%\begin{tabular}{c}
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|
566 |
%\includegraphics[scale=0.15]{../pics/servers.png}\\[-2mm]
|
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|
567 |
%\small Server
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|
568 |
%\end{tabular}
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|
569 |
%\end{textblock}
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|
570 |
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|
571 |
%\begin{textblock}{1}(5.6,4)
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|
572 |
% \begin{tikzpicture}[scale=1.1]
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|
573 |
% \draw[white] (0,1) node (X) {};
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|
574 |
% \draw[white] (2,1) node (Y) {};
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|
575 |
% \draw[white] (0,0) node (X1) {};
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576 |
% \draw[white] (2,0) node (Y1) {};
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|
577 |
% \draw[white] (0,-1) node (X2) {};
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|
578 |
% \draw[white] (2,-1) node (Y2) {};
|
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|
579 |
% \draw[red, <-, line width = 2mm] (X) -- (Y);
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|
580 |
% \node [inner sep=5pt,label=above:\textcolor{black}{GET request}] at ($ (X)!.5!(Y) $) {};
|
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|
581 |
% \draw[red, ->, line width = 2mm] (X1) -- (Y1);
|
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|
582 |
% \node [inner sep=5pt,label=above:\textcolor{black}{webpage}] at ($ (X1)!.5!(Y1) $) {};
|
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|
583 |
% \draw[red, <-, line width = 2mm] (X2) -- (Y2);
|
|
|
584 |
% \node [inner sep=7pt,label=above:\textcolor{black}{POST data}] at ($ (X2)!.5!(Y2) $) {};
|
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|
585 |
% \end{tikzpicture}
|
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|
586 |
%\end{textblock}
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|
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%\begin{textblock}{1}(9,5.5)
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|
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%\begin{tabular}{c}
|
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|
591 |
%\includegraphics[scale=0.15]{../pics/laptop.png}\\[-2mm]
|
|
|
592 |
%\small Browser
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|
593 |
%\end{tabular}
|
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|
594 |
%\end{textblock}
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|
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%\end{frame}
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%\begin{frame}[c]
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|
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%
|
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|
601 |
%{\lstset{language=Java}\fontsize{7}{8}\selectfont
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|
602 |
%\texttt{\lstinputlisting{URLReader.java}}}
|
|
|
603 |
%
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|
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%\end{frame}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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|
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|
608 |
\begin{frame}[c, fragile]
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359
|
609 |
%%\frametitle{General Scheme of}
|
|
356
|
610 |
|
|
358
|
611 |
\small
|
|
|
612 |
\begin{lstlisting}[language=Scala,numbers=none]
|
|
|
613 |
def fname(arg1: ty1, arg2: ty2,..., argn: tyn): rty = {
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|
356
|
614 |
|
|
358
|
615 |
....
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|
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|
616 |
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617 |
}
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|
618 |
\end{lstlisting}
|
|
|
619 |
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|
620 |
|
|
|
621 |
\end{frame}
|
|
|
622 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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|
623 |
|
|
359
|
624 |
\begin{frame}[c, fragile]
|
|
|
625 |
|
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|
626 |
\begin{lstlisting}[language=Scala,numbers=none]
|
|
|
627 |
def average(xs: List[Int]) : Int = {
|
|
|
628 |
val s = xs.sum
|
|
|
629 |
val n = xs.length
|
|
|
630 |
s / n
|
|
|
631 |
}
|
|
|
632 |
\end{lstlisting}
|
|
|
633 |
|
|
|
634 |
|
|
|
635 |
\end{frame}
|
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|
636 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
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|
637 |
|
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|
638 |
|
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639 |
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|
640 |
|
|
309
|
641 |
|
|
356
|
642 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
643 |
%\begin{frame}[c]
|
|
|
644 |
% \frametitle{Coursework Dates}
|
|
|
645 |
%
|
|
|
646 |
%Similar to C++:\bigskip
|
|
|
647 |
%
|
|
|
648 |
%\begin{itemize}
|
|
|
649 |
% \item Preliminary Parts: Wednesdays 4pm
|
|
|
650 |
% \begin{itemize}
|
|
|
651 |
% \item Preliminary Part 6: 3\% (13 November)
|
|
|
652 |
% \item Preliminary Part 7: 4\% (20 November)
|
|
|
653 |
% \item Preliminary Part 8: 4\% (27 November)
|
|
|
654 |
% \item Preliminary Part 9: 4\% (5 December)
|
|
|
655 |
% \end{itemize}\medskip
|
|
|
656 |
% \item Core Part: 35\% (15 January 2020)\bigskip
|
|
|
657 |
%\end{itemize}
|
|
|
658 |
%\end{frame}
|
|
|
659 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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309
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660 |
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661 |
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662 |
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663 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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|
664 |
%\begin{frame}[c]
|
|
|
665 |
%\frametitle{Coursework}
|
|
|
666 |
%
|
|
|
667 |
%\begin{itemize}
|
|
|
668 |
%\item Sorry, I might have been a bit wordy:\\
|
|
|
669 |
% Part 6 of CW description is 7 pages, but
|
|
|
670 |
% I only needed \mbox{< 100} loc for \emph{all} Part 6.\bigskip
|
|
|
671 |
%
|
|
|
672 |
%\item there is feedback when pushing code to github\medskip
|
|
|
673 |
%
|
|
|
674 |
%\item there are \texttt{jar}-files you can use to test
|
|
|
675 |
% my reference implementation\bigskip
|
|
|
676 |
%
|
|
|
677 |
%\item we want you to learn FP!\smallskip\\ \alert{\bf no vars}, no mutable
|
|
|
678 |
% data-structures\\ \quad{}e.g.~no \texttt{Arrays}, no \texttt{ListBuffer}
|
|
|
679 |
%\end{itemize}
|
|
|
680 |
%
|
|
|
681 |
%\LEFTarrow{1}{11}{11.8}
|
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|
682 |
%\end{frame}
|
|
140
|
683 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
684 |
|
|
|
685 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
686 |
|
|
|
687 |
\begin{frame}[c, fragile]
|
|
|
688 |
\frametitle{The Joy of Immutability}
|
|
|
689 |
|
|
|
690 |
\begin{itemize}
|
|
|
691 |
\item If you need to manipulate some data in a list say, then you make
|
|
|
692 |
a new list with the updated values, rather than revise the original
|
|
|
693 |
list. Easy!\medskip
|
|
|
694 |
|
|
|
695 |
{\small
|
|
|
696 |
\begin{lstlisting}[language=Scala, numbers=none, xleftmargin=-1mm]
|
|
|
697 |
val old_list = List(1, 2, 3, 5)
|
|
|
698 |
val new_list = 0 :: old_list
|
|
308
|
699 |
// -> List(0, 1, 2, 3, 4, 5)
|
|
140
|
700 |
\end{lstlisting}}
|
|
|
701 |
|
|
200
|
702 |
\item You do not have to be defensive about who can access the data.
|
|
|
703 |
|
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|
704 |
\item You can look at your code in isolation.
|
|
140
|
705 |
\end{itemize}
|
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|
706 |
\end{frame}
|
|
|
707 |
|
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|
708 |
|
|
|
709 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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|
710 |
|
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|
711 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
712 |
\begin{frame}[t]
|
|
|
713 |
\frametitle{Email: Hate 'val'}
|
|
|
714 |
|
|
308
|
715 |
\mbox{}\\[-23mm]\mbox{}
|
|
140
|
716 |
|
|
|
717 |
\begin{center}
|
|
|
718 |
\begin{bubble}[10.5cm]
|
|
354
|
719 |
Subject: \textbf{Hate '\textbf{\texttt{val}}'}\hfill 01:00 AM\hspace{1cm}\medskip\\
|
|
140
|
720 |
|
|
|
721 |
Hello Mr Urban,\medskip\\
|
|
|
722 |
|
|
|
723 |
I just wanted to ask, how are we suppose to work
|
|
|
724 |
with the completely useless \textbf{\texttt{val}}, that can’t be changed ever? Why is
|
|
|
725 |
this rule active at all? I’ve spent 4 hours not thinking on the
|
|
|
726 |
coursework, but how to bypass this annoying rule. What’s the whole
|
|
|
727 |
point of all these coursework, when we can’t use everything Scala
|
|
|
728 |
gives us?!?\medskip\\
|
|
|
729 |
|
|
|
730 |
Regards.\\
|
|
|
731 |
\mbox{}\hspace{5mm}\textcolor{black!50}{<<deleted>>}\\
|
|
|
732 |
\end{bubble}
|
|
|
733 |
\end{center}
|
|
|
734 |
|
|
|
735 |
\end{frame}
|
|
|
736 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
737 |
|
|
|
738 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
739 |
\begin{frame}[c]
|
|
|
740 |
|
|
|
741 |
\mbox{}\\[-25mm]\mbox{}
|
|
|
742 |
|
|
|
743 |
\begin{center}
|
|
|
744 |
\begin{bubble}[10.5cm]
|
|
354
|
745 |
Subject: \textbf{Re: Hate '\textbf{\texttt{val}}'}\hfill 01:02 AM\hspace{1cm}\bigskip\bigskip\\
|
|
140
|
746 |
|
|
|
747 |
\textcolor{black!70}{
|
|
|
748 |
\textit{\large<<my usual rant about fp\ldots\\ concurrency bla bla\ldots{} better programs
|
|
|
749 |
yada>>}}\bigskip\bigskip\bigskip
|
|
|
750 |
|
|
|
751 |
PS: What are you trying to do where you desperately want to use \texttt{var}?
|
|
|
752 |
\end{bubble}
|
|
|
753 |
\end{center}
|
|
|
754 |
|
|
|
755 |
\end{frame}
|
|
|
756 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
757 |
|
|
|
758 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
759 |
\begin{frame}[c,fragile]
|
|
|
760 |
|
|
|
761 |
\begin{textblock}{6}(0.5,0.5)
|
|
|
762 |
\begin{bubble}[11.5cm]
|
|
|
763 |
\small
|
|
354
|
764 |
Subject: \textbf{Re: Re: Hate '\textbf{\texttt{val}}'}\hfill 01:04 AM\hspace{1cm}\medskip\\
|
|
140
|
765 |
|
|
|
766 |
\textbf{Right now my is\_legal function works fine:}
|
|
|
767 |
|
|
|
768 |
\footnotesize\begin{lstlisting}[language=Scala, numbers=none, xleftmargin=-1mm]
|
|
|
769 |
def is_legal(dim: Int, path: Path)(x: Pos): Boolean = {
|
|
|
770 |
var boolReturn = false
|
|
|
771 |
if(x._1 > dim || x._2 > dim || x._1 < 0 || x._2 < 0) {
|
|
|
772 |
else { var breakLoop = false
|
|
|
773 |
if(path == Nil) { boolReturn = true }
|
|
|
774 |
else { for(i <- 0 until path.length) {
|
|
|
775 |
if(breakLoop == false) {
|
|
|
776 |
if(path(i) == x) {
|
|
|
777 |
boolReturn = true
|
|
|
778 |
breakLoop = true
|
|
|
779 |
}
|
|
|
780 |
else { boolReturn = false }
|
|
|
781 |
} else breakLoop
|
|
|
782 |
}
|
|
|
783 |
}
|
|
|
784 |
boolReturn
|
|
|
785 |
}
|
|
|
786 |
\end{lstlisting}
|
|
|
787 |
\end{bubble}
|
|
|
788 |
\end{textblock}
|
|
|
789 |
|
|
|
790 |
\begin{textblock}{6}(8.2,11.8)
|
|
|
791 |
\begin{bubble}[5.5cm]\footnotesize\bf
|
|
|
792 |
\ldots{}but I can’t make it work with boolReturn being val. What approach would
|
|
|
793 |
you recommend in this case, and is using var in this case justified?
|
|
|
794 |
\end{bubble}
|
|
|
795 |
\end{textblock}
|
|
|
796 |
|
|
|
797 |
\only<2>{
|
|
|
798 |
\begin{textblock}{6}(0.3,11.8)
|
|
|
799 |
\begin{bubble}[3.1cm]
|
|
|
800 |
\textbf{Me:}
|
|
|
801 |
\raisebox{-12mm}{\includegraphics[scale=0.08]{../pics/throwup.jpg}}
|
|
|
802 |
\end{bubble}
|
|
|
803 |
\end{textblock}}
|
|
|
804 |
|
|
|
805 |
\end{frame}
|
|
|
806 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
807 |
|
|
|
808 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
809 |
\begin{frame}[t,fragile]
|
|
|
810 |
|
|
|
811 |
\mbox{}\\[-25mm]\mbox{}
|
|
|
812 |
|
|
|
813 |
\begin{textblock}{6}(0.5,2)
|
|
|
814 |
\begin{bubble}[11.5cm]
|
|
|
815 |
Subject: \textbf{Re: Re: Re: Hate '\textbf{\texttt{val}}'}\hfill 01:06 AM\bigskip\\
|
|
|
816 |
\small
|
|
|
817 |
|
|
|
818 |
OK. So you want to make sure that the \texttt{x}-position is not outside the
|
|
|
819 |
board....and furthermore you want to make sure that the \texttt{x}-position
|
|
|
820 |
is not yet in the path list. How about something like\bigskip
|
|
|
821 |
|
|
|
822 |
\footnotesize\begin{lstlisting}[language=Scala, numbers=none, xleftmargin=-1mm]
|
|
|
823 |
def is_legal(dim: Int, path: Path)(x: Pos): Boolean =
|
|
|
824 |
...<<some board conditions>>... && !path.contains(x)
|
|
|
825 |
\end{lstlisting}\bigskip
|
|
|
826 |
|
|
|
827 |
\small Does not even contain a \texttt{val}.
|
|
|
828 |
\end{bubble}
|
|
|
829 |
\end{textblock}
|
|
|
830 |
|
|
|
831 |
\begin{textblock}{6}(7,12)
|
|
|
832 |
\footnotesize\textcolor{black!50}{(This is all on one line)}
|
|
|
833 |
\end{textblock}
|
|
|
834 |
|
|
|
835 |
\end{frame}
|
|
|
836 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
837 |
|
|
|
838 |
|
|
|
839 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
840 |
\begin{frame}[t,fragile]
|
|
|
841 |
|
|
|
842 |
\mbox{}\\[-15mm]\mbox{}
|
|
|
843 |
|
|
|
844 |
\begin{textblock}{6}(1,3)
|
|
|
845 |
\begin{bubble}[10.5cm]
|
|
|
846 |
Subject: \textbf{Re: Re: Re: Re: Hate '\textbf{\texttt{val}}'}\hfill 11:02 AM\bigskip\bigskip\\
|
|
|
847 |
|
|
|
848 |
THANK YOU! You made me change my coding perspective. Because of you,
|
|
|
849 |
I figured out the next one\ldots
|
|
|
850 |
\end{bubble}
|
|
|
851 |
\end{textblock}
|
|
|
852 |
|
|
|
853 |
\only<2>{
|
|
|
854 |
\begin{textblock}{6}(0.3,11.8)
|
|
|
855 |
\begin{bubble}[3.1cm]
|
|
|
856 |
\textbf{Me:}
|
|
|
857 |
\raisebox{-12mm}{\includegraphics[scale=0.15]{../pics/happy.jpg}}
|
|
|
858 |
\end{bubble}
|
|
|
859 |
\end{textblock}}
|
|
|
860 |
|
|
|
861 |
\end{frame}
|
|
|
862 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
863 |
|
|
|
864 |
|
|
|
865 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
866 |
\begin{frame}[c]
|
|
309
|
867 |
\frametitle{Conclusion for Today}
|
|
33
|
868 |
|
|
|
869 |
\begin{itemize}
|
|
309
|
870 |
\item Scala is still under development, 2.13.1 came out in Sept.\\
|
|
|
871 |
(the compiler is terribly slow)\medskip
|
|
33
|
872 |
\item {\bf\url{http://www.scala-lang.org/}}\bigskip
|
|
140
|
873 |
|
|
|
874 |
\item it is a rather \textbf{\alert{deep}} language\ldots i.e.~gives
|
|
|
875 |
you a lot of rope to shoot yourself\bigskip
|
|
33
|
876 |
|
|
140
|
877 |
\item learning functional programming is not easy\ldots{}when you have
|
|
200
|
878 |
spent all of your career thinking in an imperative way, it is hard to
|
|
140
|
879 |
change\bigskip\medskip
|
|
|
880 |
|
|
200
|
881 |
\item hope you have fun with Scala and the assignments
|
|
33
|
882 |
\end{itemize}
|
|
|
883 |
\end{frame}
|
|
|
884 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
885 |
|
|
|
886 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
356
|
887 |
%\begin{frame}[c]
|
|
|
888 |
%\frametitle{\begin{tabular}{c}\\[0cm]\alert{Questions?}\end{tabular}}
|
|
|
889 |
%
|
|
|
890 |
%\begin{center}
|
|
|
891 |
% \begin{tabular}[t]{@{}l@{}l@{}}
|
|
|
892 |
% \includegraphics[scale=0.1]{../pics/mand4.png} & \hspace{4mm}
|
|
|
893 |
% \raisebox{0mm}{\includegraphics[scale=0.1]{../pics/mand3.png}}
|
|
|
894 |
% \end{tabular}
|
|
|
895 |
%\end{center}
|
|
|
896 |
%
|
|
|
897 |
%\begin{center}
|
|
|
898 |
% My Office Hours: Thursdays 12 -- 14\\
|
|
|
899 |
% And specifically for Scala: Tuesdays 10:45 -- 11:45
|
|
|
900 |
%\end{center}
|
|
|
901 |
%\end{frame}
|
|
33
|
902 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
314
|
903 |
|
|
|
904 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
356
|
905 |
%\begin{frame}[t]%
|
|
|
906 |
%
|
|
|
907 |
%\begin{center}
|
|
|
908 |
%\includegraphics[scale=0.4]{../pics/blow.png}
|
|
|
909 |
%\end{center}
|
|
|
910 |
%
|
|
|
911 |
%\begin{textblock}{14}(2,12.4)
|
|
|
912 |
%\Large\bf{}Mind-Blowing\\ Programming Languages: C/C++
|
|
|
913 |
%\end{textblock}
|
|
|
914 |
%\end{frame}
|
|
314
|
915 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
916 |
|
|
360
|
917 |
\begin{frame}[c]
|
|
|
918 |
\begin{center}
|
|
|
919 |
\includegraphics[scale=0.4]{../pics/fun.png}
|
|
|
920 |
\end{center}
|
|
|
921 |
\end{frame}
|
|
32
|
922 |
|
|
416
|
923 |
\begin{frame}<1-20>[t]
|
|
360
|
924 |
|
|
|
925 |
\end{frame}
|
|
32
|
926 |
|
|
22
|
927 |
\end{document}
|
|
|
928 |
|
|
|
929 |
%%% Local Variables:
|
|
|
930 |
%%% mode: latex
|
|
|
931 |
%%% TeX-master: t
|
|
|
932 |
%%% End:
|
|
|
933 |
|
|
140
|
934 |
|
|
|
935 |
“Functional programming is often regarded as the best-kept secret of
|
|
|
936 |
scientific modelers, mathematicians, artificial intelligence
|
|
|
937 |
researchers, financial institutions, graphic designers, CPU designers,
|
|
|
938 |
compiler programmers, and telecommunications engineers.”
|
|
|
939 |
|
|
|
940 |
The Wikipedia F# page |