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\documentclass[dvipsnames,14pt,t]{beamer}
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\usepackage{beamerthemeplainculight}
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\usepackage[T1]{fontenc}
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\usepackage[latin1]{inputenc}
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\usepackage{mathpartir}
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\usepackage[absolute,overlay]{textpos}
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\usepackage{ifthen}
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\usepackage{tikz}
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\usepackage{pgf}
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\usepackage{calc}
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\usepackage{ulem}
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\usepackage{courier}
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\usepackage{listings}
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\renewcommand{\uline}[1]{#1}
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\usetikzlibrary{arrows}
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\usetikzlibrary{automata}
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\usetikzlibrary{shapes}
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\usetikzlibrary{shadows}
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\usetikzlibrary{positioning}
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\usetikzlibrary{calc}
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%%%\usetikzlibrary{mindmap}
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\usepackage{graphicx}
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\definecolor{javared}{rgb}{0.6,0,0} % for strings
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\definecolor{javagreen}{rgb}{0.25,0.5,0.35} % comments
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\definecolor{javapurple}{rgb}{0.5,0,0.35} % keywords
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\definecolor{javadocblue}{rgb}{0.25,0.35,0.75} % javadoc
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\lstset{language=Java,
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basicstyle=\ttfamily,
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keywordstyle=\color{javapurple}\bfseries,
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stringstyle=\color{javagreen},
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commentstyle=\color{javagreen},
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morecomment=[s][\color{javadocblue}]{/**}{*/},
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numbers=left,
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numberstyle=\tiny\color{black},
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stepnumber=1,
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numbersep=10pt,
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tabsize=2,
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showspaces=false,
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showstringspaces=false}
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\lstdefinelanguage{scala}{
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morekeywords={abstract,case,catch,class,def,%
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do,else,extends,false,final,finally,%
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for,if,implicit,import,match,mixin,%
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new,null,object,override,package,%
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private,protected,requires,return,sealed,%
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super,this,throw,trait,true,try,%
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type,val,var,while,with,yield},
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otherkeywords={=>,<-,<\%,<:,>:,\#,@},
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sensitive=true,
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morecomment=[l]{//},
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morecomment=[n]{/*}{*/},
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morestring=[b]",
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morestring=[b]',
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morestring=[b]"""
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}
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\lstset{language=Scala,
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basicstyle=\ttfamily,
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keywordstyle=\color{javapurple}\bfseries,
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stringstyle=\color{javagreen},
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commentstyle=\color{javagreen},
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morecomment=[s][\color{javadocblue}]{/**}{*/},
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numbers=left,
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numberstyle=\tiny\color{black},
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stepnumber=1,
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numbersep=10pt,
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tabsize=2,
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showspaces=false,
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showstringspaces=false}
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% beamer stuff
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\renewcommand{\slidecaption}{Scala, King's College London, 27.~March 2012}
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\begin{document}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\mode<presentation>{
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\begin{frame}<1>[t]
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\frametitle{%
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\begin{tabular}{@ {\hspace{-3mm}}c@ {}}
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\\
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\large \textcolor{black}{PRA, Programming Applications:}\\[5mm]
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\Huge Scala\\[-1mm]
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\large ``Better Java'' for Programming the JVM\\[5mm]
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\normalsize \textcolor{black}{Christian Urban}
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\end{tabular}}
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\end{frame}}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\mode<presentation>{
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\begin{frame}[c]
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\frametitle{\begin{tabular}{c}1.~Reason\end{tabular}}
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\begin{textblock}{6}(1,3)
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\begin{tabular}{l}
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\mbox{}\hspace{-1mm}\includegraphics[scale=0.36]{twitter.png}\\[-1mm]
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\includegraphics[scale=0.30]{linked.png}\\
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\includegraphics[scale=0.30]{guardian.jpg}\\[-3mm]
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\mbox{}\hspace{-2mm}\includegraphics[scale=0.38]{morgan.png}\\[-3mm]
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\includegraphics[scale=0.30]{suisse.png}\\
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\includegraphics[scale=0.20]{edf.png}\\[-1mm]
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\includegraphics[scale=0.08]{novell.png}\\[-1mm]
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\includegraphics[scale=0.30]{foursquare.png}\\
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\includegraphics[scale=0.30]{hsbc.png}\\
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{\large\bf ...}
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\end{tabular}
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\end{textblock}
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\only<2->{
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\begin{textblock}{6}(6,3)
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\includegraphics[scale=0.35]{jobgraph.png}\\
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\end{textblock}}
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\only<3->{
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\begin{textblock}{6}(7.3,9.2)
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\begin{tabular}{l}
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\footnotesize 2013: 1$\%$\\[-2mm]
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\footnotesize 2014: 3$\%$\\[-2mm]
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\footnotesize 2015: 9$\%$\\[-2mm]
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\footnotesize 2016: 27$\%$\\[-2mm]
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\footnotesize 2017: 81$\%$\\[-2mm]
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\footnotesize 2018: 243$\%$ \raisebox{-1mm}{\includegraphics[scale=0.02]{smiley.jpg}}
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\end{tabular}
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\end{textblock}}
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\only<3->{
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\begin{textblock}{6}(6,9.5)
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\footnotesize 5 yrs $\begin{cases}\mbox{}\\[1.4cm]\end{cases}$
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\end{textblock}}
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\only<4->{
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\begin{textblock}{11}(5,14.1)
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\textcolor{gray}{
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\footnotesize {\bf in London today:} 1 Scala job for every 30 Java jobs;\\[-2mm]
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Scala programmers seem to get up to 20\% better salary}
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\end{textblock}}
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\end{frame}}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\mode<presentation>{
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\begin{frame}[c]
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\frametitle{\begin{tabular}{c}2.~Reason\end{tabular}}
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\begin{textblock}{11}(1,7)
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\begin{tikzpicture}[scale=1.0]
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%\draw[step=2mm] (-1,-1) grid (10,1);
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\draw[->, line width=2mm] (-0.2,0) -- (11,0);
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\draw[line width=0.8mm] (0,0) -- (0,-0.3);
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\node at (0,-0.5) [black] {\footnotesize 1985};
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\draw[line width=0.8mm] (2.8,0) -- (2.8,-0.3);
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\node at (2.8,-0.5) [black] {\footnotesize 1992};
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\draw[line width=0.8mm] (1.2,0) -- (1.2,-0.3);
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\node at (1.2,-0.5) [black] {\footnotesize 1988};
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\draw[line width=0.8mm] (4.8,0) -- (4.8,-0.3);
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\node at (4.8,-0.5) [black] {\footnotesize 1997};
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\draw[line width=0.8mm] (6,0) -- (6,-0.3);
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\node at (6,-0.5) [black] {\footnotesize 2000};
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\draw[line width=0.8mm] (7.6,0) -- (7.6,-0.3);
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\node at (7.6,-0.5) [black] {\footnotesize 2004};
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\draw[line width=0.8mm] (10.4,0) -- (10.4,-0.3);
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\node at (10.4,-0.5) [black] {\footnotesize 2011};
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\end{tikzpicture}
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\end{textblock}
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\begin{textblock}{5}(1,9)
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\small Basic\\[-1mm]
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Assembler\\
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\end{textblock}
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\begin{textblock}{5}(2.8,11)
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\small Pascal\\[-1mm]
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C\\
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\end{textblock}
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\begin{textblock}{5}(4.3,9)
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\small Modula 3\\[-1mm]
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C++\\
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\end{textblock}
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\begin{textblock}{5}(6.7,9)
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\small $\lambda$Prolog\\
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\end{textblock}
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\begin{textblock}{5}(8.6,9)
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\small Ocaml\\[-1mm]
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\small SMLj\\[-1mm]
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\small Pizza
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\end{textblock}
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\begin{textblock}{5}(10.6,9)
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\normalsize\bf SML\\[-1mm]
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\end{textblock}
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\begin{textblock}{5}(14,9)
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\small Scala\\
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\end{textblock}
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\begin{textblock}{5}(13.2,11)
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\small \underline{Future?}\\[0mm]
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\small Python\\[-1mm]
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\small Ruby\\[-1mm]
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\small Javascript\\
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\end{textblock}
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\begin{textblock}{5}(0.2,2)
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\includegraphics[scale=0.30]{punch.jpg}\\
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\end{textblock}
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\begin{textblock}{5}(0.4,4.5)
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\includegraphics[scale=0.20]{plus4.jpg}\\
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\end{textblock}
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\begin{textblock}{5}(2.8,2.1)
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\includegraphics[scale=0.15]{robotron.jpg}\\
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\end{textblock}
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\begin{textblock}{5}(5.0,3.7)
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\includegraphics[scale=0.10]{sparc.jpg}\\
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\end{textblock}
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\begin{textblock}{5}(8.0,4)
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\includegraphics[scale=0.40]{titanium.jpg}\\
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\end{textblock}
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\begin{textblock}{5}(12,4.5)
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\includegraphics[scale=0.10]{air.jpg}\\
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\end{textblock}
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\end{frame}}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\mode<presentation>{
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\begin{frame}[c]
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\frametitle{\begin{tabular}{c}Why Scala?\end{tabular}}
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\large
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\begin{itemize}
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\item compiles to JVM (.Net \& Android)\bigskip
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\item integrates seamlessly with Java (Swing)\bigskip
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\end{itemize}
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\end{frame}}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\mode<presentation>{
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\begin{frame}[c]
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\frametitle{\begin{tabular}{c}Why Scala?\end{tabular}}
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\large
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\begin{itemize}
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\item combines {\bf functional} and {\bf object-oriented} programming
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\end{itemize}
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\end{frame}}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\mode<presentation>{
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\begin{frame}[c]
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\frametitle{\begin{tabular}{c}Why Scala?\end{tabular}}
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\begin{itemize}
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\item \large {\bf Actors}:\\
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\normalsize keep asynchronous concurrency simple
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\end{itemize}
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\end{frame}}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\mode<presentation>{
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\begin{frame}[c]
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\frametitle{\begin{tabular}{c}Why Scala?\end{tabular}}
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\begin{itemize}
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\item \large {\bf Immutability}:\\
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\normalsize keeps concurrency predictable
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\end{itemize}
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\end{frame}}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\mode<presentation>{
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\begin{frame}[c]
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\frametitle{\begin{tabular}{c}Why Scala?\end{tabular}}
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\begin{itemize}
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\item \large {\bf First-Class Functions}:\\
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\normalsize powerful idea from functional programming
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\end{itemize}
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\end{frame}}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\mode<presentation>{
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\begin{frame}[c]
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\frametitle{\begin{tabular}{c}Why Scala?\end{tabular}}
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\begin{itemize}
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\item \large {\bf Pattern-Matching}:\\
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\normalsize ``keeps your needles out of the haystacks''
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\end{itemize}
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\end{frame}}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\mode<presentation>{
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\begin{frame}[t]
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\frametitle{\begin{tabular}{c}Why Scala?\end{tabular}}
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\begin{itemize}
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\item \large {\bf You can avoid \textcolor{blue}{\texttt{null}}}:
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\end{itemize}
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\begin{textblock}{6}(0.5,5)
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\begin{tikzpicture}
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\draw (0,0) node[inner sep=3mm,fill=cream, ultra thick, draw=red, rounded corners=2mm]
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{ \begin{minipage}{11cm}\raggedright\small
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``I call it my billion-dollar mistake. It was the invention of the null reference in
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1965. At that time, I was designing the first comprehensive type system for references in an
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object oriented language (ALGOL W). My goal was to ensure that all use of references should
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be absolutely safe, with checking performed automatically by the compiler. But I couldn't resist
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the temptation to put in a null reference, simply because it was so easy to implement. This has
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led to innumerable errors, vulnerabilities, and system crashes, which have probably caused
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a billion dollars of pain and damage in the last forty years.'' Sir Tony Hoare\end{minipage}};
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\end{tikzpicture}
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\end{textblock}
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\begin{textblock}{5}(11.8,1)
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\includegraphics[scale=0.20]{hoare.jpg}\\
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\end{textblock}
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\mode<presentation>{
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\begin{frame}[c]
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\frametitle{\begin{tabular}{c}\texttt{null}\end{tabular}}
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\lstset{language=java}\footnotesize
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\texttt{\lstinputlisting{MapJavaTester.java}}
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\end{frame}}
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\mode<presentation>{
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\begin{frame}[c]
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\frametitle{\begin{tabular}{c}Why Scala?\end{tabular}}
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358 |
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359 |
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\begin{itemize}
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\item \large The Price You Pay with Scala: \textcolor{red}{\bf Complexity}\\
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\normalsize But it is worth it!
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\end{itemize}
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\end{frame}}
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\mode<presentation>{
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\begin{frame}[c]
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\frametitle{\begin{tabular}{c}Java: A Brief History\end{tabular}}
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\begin{itemize}
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\item Released in 1995 by James Gosling from \\Sun Microsystems (work started in 1991)\medskip
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\item derives much of its syntax from C and C++\medskip
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\item compiles to JVM (``write once, run everywhere'')\medskip
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\item no pointers --- instead automatic memory management (has a garbage collector)\medskip
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\item statically typed\\ (``you cannot compare apples with oranges'')
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\end{itemize}
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\begin{textblock}{5}(13,2)
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\includegraphics[scale=0.20]{java.png}\\
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\end{textblock}
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\end{frame}}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\mode<presentation>{
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\begin{frame}[c]
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\lstset{language=java}\fontsize{8}{10}\selectfont
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\texttt{\lstinputlisting{FruitMain.java}}
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\only<2>{
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\begin{textblock}{6}(5,5)
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\begin{tikzpicture}
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\draw (0,0) node[inner sep=3mm,fill=cream, ultra thick, draw=red, rounded corners=2mm]
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{\begin{minipage}{8cm}\raggedright\tt\footnotesize
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\begin{tabular}{l}
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FruitMain.java:20:~incompatible types\\
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found: Orange\\
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required: Apple\\
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a = o;\\
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1 error\\
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\end{tabular}
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\end{minipage}};
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\end{tikzpicture}
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\end{textblock}}
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\end{frame}}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\mode<presentation>{
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\begin{frame}[c]
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419 |
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\lstset{language=java}\fontsize{8}{10}\selectfont
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\texttt{\lstinputlisting{FruitArray.java}}
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422 |
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\only<2>{
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\begin{textblock}{8}(1,5)
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\begin{tikzpicture}
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\draw (0,0) node[inner sep=3mm,fill=cream, ultra thick, draw=red, rounded corners=2mm]
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427 |
{\begin{minipage}{11cm}\raggedright\tt\fontsize{8}{10}\selectfont
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\begin{tabular}{l}
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|
429 |
{\large \rm runtime exception}\\
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|
430 |
orange\\
|
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|
431 |
Exception in thread "main" java.lang.ArrayStoreException:~Apple\\
|
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432 |
at FruitArray.main(FruitArray.java:21)\\
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\end{tabular}
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\end{minipage}};
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\end{tikzpicture}
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\end{textblock}}
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\end{frame}}
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\mode<presentation>{
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445 |
\begin{frame}[c]
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446 |
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|
447 |
\begin{itemize}
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|
448 |
\item {\bf In Java a class for students}
|
|
|
449 |
\end{itemize}
|
|
|
450 |
|
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|
451 |
{\lstset{language=java}\fontsize{8}{10}\selectfont
|
|
|
452 |
\texttt{\lstinputlisting{Student.java}}}
|
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|
453 |
|
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|
454 |
\onslide<2->{
|
|
|
455 |
\begin{itemize}
|
|
|
456 |
\item {\bf Same in Scala}
|
|
|
457 |
\end{itemize}
|
|
|
458 |
|
|
|
459 |
{\lstset{language=Scala}\fontsize{8}{10}\selectfont
|
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|
460 |
\texttt{\lstinputlisting{Student.scala}}}}
|
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|
461 |
|
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|
462 |
\end{frame}}
|
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|
463 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
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464 |
|
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465 |
|
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|
466 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
467 |
\mode<presentation>{
|
|
|
468 |
\begin{frame}[c]
|
|
|
469 |
\frametitle{\begin{tabular}{c}Scala\end{tabular}}
|
|
|
470 |
|
|
|
471 |
\begin{itemize}
|
|
|
472 |
\item First released in 2003 (work started in 2001) by Martin Odersky from EPFL in Lausanne\smallskip
|
|
|
473 |
\item at the moment 2.9.2 (2012)\smallskip
|
|
|
474 |
\item blend of functional and oo-programming\medskip\medskip
|
|
|
475 |
\item Twitter switched in 2009 from Ruby to Scala
|
|
|
476 |
\item Guardian switched in 2011 from Java to Scala
|
|
|
477 |
\item UBS approved it for general production usage (2011)
|
|
|
478 |
\end{itemize}
|
|
|
479 |
|
|
|
480 |
|
|
|
481 |
\end{frame}}
|
|
|
482 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
483 |
|
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|
484 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
485 |
\mode<presentation>{
|
|
|
486 |
\begin{frame}[t]
|
|
|
487 |
|
|
|
488 |
\only<1>{
|
|
|
489 |
Hello World in Java:\medskip
|
|
|
490 |
{\lstset{language=Java}\fontsize{12}{14}\selectfont
|
|
|
491 |
\texttt{\lstinputlisting{Hello.java}}}}
|
|
|
492 |
\only<2->{
|
|
|
493 |
Hello World in Scala:\medskip
|
|
|
494 |
{\lstset{language=Scala}\fontsize{12}{14}\selectfont
|
|
|
495 |
\texttt{\lstinputlisting{Hello.scala}}}\bigskip\medskip
|
|
|
496 |
|
|
|
497 |
|
|
|
498 |
Some curiosities, compared to Java:
|
|
|
499 |
\begin{itemize}
|
|
|
500 |
\item<3-> The semicolons are missing.
|
|
|
501 |
\item<4-> The {\bf\texttt{public}} access modifier is missing.
|
|
|
502 |
\item<5-> The declaration of main starts with {\bf\texttt{def}}.
|
|
|
503 |
\item<6-> main returns mysterious type {\bf\texttt{Unit}}.
|
|
|
504 |
\item<7-> In Scala there is {\bf\texttt{object}} and {\bf\texttt{class}}.
|
|
|
505 |
\end{itemize}}
|
|
|
506 |
|
|
|
507 |
|
|
|
508 |
\end{frame}}
|
|
|
509 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
510 |
|
|
|
511 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
512 |
\mode<presentation>{
|
|
|
513 |
\begin{frame}[c]
|
|
|
514 |
|
|
|
515 |
\begin{center}
|
|
|
516 |
\textcolor{ProcessBlue}{\LARGE\bf Demo}
|
|
|
517 |
\end{center}
|
|
|
518 |
\end{frame}}
|
|
|
519 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
520 |
|
|
|
521 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
522 |
\mode<presentation>{
|
|
|
523 |
\begin{frame}[c]
|
|
|
524 |
\frametitle{\begin{tabular}{c}Functions\end{tabular}}
|
|
|
525 |
|
|
|
526 |
Transformations:\bigskip
|
|
|
527 |
\begin{center}
|
|
|
528 |
\LARGE
|
|
|
529 |
Input(s) $\Rightarrow$ Output\bigskip\bigskip
|
|
|
530 |
\end{center}\pause
|
|
|
531 |
|
|
|
532 |
``Given some input; produce some output.''\\
|
|
|
533 |
``Transform the input into some output.''\\
|
|
|
534 |
|
|
|
535 |
\end{frame}}
|
|
|
536 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
537 |
|
|
|
538 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
539 |
\mode<presentation>{
|
|
|
540 |
\begin{frame}[c]
|
|
|
541 |
\frametitle{\begin{tabular}{c}Functions in Scala\end{tabular}}
|
|
|
542 |
|
|
|
543 |
\mbox{}\bigskip\bigskip\bigskip\bigskip
|
|
|
544 |
{\lstset{language=Scala}\fontsize{12}{14}\selectfont
|
|
|
545 |
\texttt{\lstinputlisting{max.scala}}}
|
|
|
546 |
|
|
|
547 |
\small
|
|
|
548 |
\begin{textblock}{8}(1,3)
|
|
|
549 |
{\bf\texttt{def}} starts a function definition
|
|
|
550 |
\end{textblock}
|
|
|
551 |
\begin{textblock}{8}(2.3,4)
|
|
|
552 |
function name
|
|
|
553 |
\end{textblock}
|
|
|
554 |
\begin{textblock}{8}(3.8,5)
|
|
|
555 |
parameter list in parentheses
|
|
|
556 |
\end{textblock}
|
|
|
557 |
\begin{textblock}{8}(6.5,6)
|
|
|
558 |
function's result type
|
|
|
559 |
\end{textblock}
|
|
|
560 |
\begin{textblock}{8}(11,7)
|
|
|
561 |
equal sign
|
|
|
562 |
\end{textblock}
|
|
|
563 |
\begin{textblock}{8}(9,10)
|
|
|
564 |
function body\\
|
|
|
565 |
in curly braces
|
|
|
566 |
\end{textblock}
|
|
|
567 |
|
|
|
568 |
\end{frame}}
|
|
|
569 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
570 |
|
|
|
571 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
572 |
\mode<presentation>{
|
|
|
573 |
\begin{frame}[c]
|
|
|
574 |
|
|
|
575 |
{\lstset{language=Java}\fontsize{7}{8}\selectfont
|
|
|
576 |
\texttt{\lstinputlisting{URLReader.java}}}
|
|
|
577 |
|
|
|
578 |
\only<2>{
|
|
|
579 |
\begin{textblock}{5}(12,2)
|
|
|
580 |
\includegraphics[scale=0.50]{skeleton.jpg}\\
|
|
|
581 |
\end{textblock}}
|
|
|
582 |
\end{frame}}
|
|
|
583 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
584 |
|
|
|
585 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
586 |
\mode<presentation>{
|
|
|
587 |
\begin{frame}[t]
|
|
|
588 |
\frametitle{\begin{tabular}{c}Map\end{tabular}}
|
|
|
589 |
|
|
|
590 |
\begin{itemize}
|
|
|
591 |
\item {\bf\texttt{map}} takes a function, say f, and applies it to every element of the list:
|
|
|
592 |
\end{itemize}
|
|
|
593 |
|
|
|
594 |
\begin{textblock}{15}(2,7)
|
|
|
595 |
\fontsize{13}{14}\selectfont
|
|
|
596 |
\bf\texttt{List(1, 2, 3, 4, 5, 6, 7, 8, 9)}
|
|
|
597 |
\end{textblock}
|
|
|
598 |
|
|
|
599 |
\begin{textblock}{15}(2,10)
|
|
|
600 |
\fontsize{13}{14}\selectfont
|
|
|
601 |
\bf\texttt{List(1, 4, 9, 16, 25, 36, 49, 64, 81)}
|
|
|
602 |
\end{textblock}
|
|
|
603 |
|
|
|
604 |
\end{frame}}
|
|
|
605 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
606 |
|
|
|
607 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
608 |
\mode<presentation>{
|
|
|
609 |
\begin{frame}<1-2>[t]
|
|
|
610 |
\frametitle{\begin{tabular}{c}Filter\end{tabular}}
|
|
|
611 |
|
|
|
612 |
\begin{itemize}
|
|
|
613 |
\item {\bf\texttt{filter}} takes a condition, say p, and filters out all elements of the list not satisfying p:
|
|
|
614 |
\end{itemize}
|
|
|
615 |
|
|
|
616 |
\begin{textblock}{15}(2,7)
|
|
|
617 |
\fontsize{13}{14}\selectfont
|
|
|
618 |
\bf\texttt{List(1, 2, 3, 4, 5, 6, 7, 8, 9)}
|
|
|
619 |
\end{textblock}
|
|
|
620 |
|
|
|
621 |
\end{frame}}
|
|
|
622 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
623 |
|
|
|
624 |
|
|
|
625 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
626 |
\mode<presentation>{
|
|
|
627 |
\begin{frame}[c]
|
|
|
628 |
\frametitle{\begin{tabular}{c}Conclusion\end{tabular}}
|
|
|
629 |
|
|
|
630 |
\begin{itemize}
|
|
|
631 |
\item Scala is still under development (compiler is slow)\medskip
|
|
|
632 |
\item there are at least 5 books on the market\medskip
|
|
|
633 |
\item {\bf\texttt{http://www.scala-lang.org/}}\medskip
|
|
|
634 |
\item ``deep'' type-system (computer science)\bigskip\pause
|
|
|
635 |
\item (for the lazy programmer)\\ programming in Scala is much more fun
|
|
|
636 |
|
|
|
637 |
\end{itemize}
|
|
|
638 |
\end{frame}}
|
|
|
639 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
|
|
640 |
|
|
|
641 |
|
|
|
642 |
\end{document}
|
|
|
643 |
|
|
|
644 |
%%% Local Variables:
|
|
|
645 |
%%% mode: latex
|
|
|
646 |
%%% TeX-master: t
|
|
|
647 |
%%% End:
|
|
|
648 |
|