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1 \documentclass[dvipsnames,14pt,t]{beamer} |
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2 \usepackage{beamerthemeplainculight} |
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3 \usepackage[T1]{fontenc} |
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4 \usepackage[latin1]{inputenc} |
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5 \usepackage{mathpartir} |
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6 \usepackage[absolute,overlay]{textpos} |
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7 \usepackage{ifthen} |
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8 \usepackage{tikz} |
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9 \usepackage{pgf} |
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10 \usepackage{calc} |
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11 \usepackage{ulem} |
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12 \usepackage{courier} |
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13 \usepackage{listings} |
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14 \renewcommand{\uline}[1]{#1} |
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15 \usetikzlibrary{arrows} |
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16 \usetikzlibrary{automata} |
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17 \usetikzlibrary{shapes} |
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18 \usetikzlibrary{shadows} |
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19 \usetikzlibrary{positioning} |
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20 \usetikzlibrary{calc} |
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21 |
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22 %%%\usetikzlibrary{mindmap} |
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23 |
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24 \usepackage{graphicx} |
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25 |
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26 \definecolor{javared}{rgb}{0.6,0,0} % for strings |
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27 \definecolor{javagreen}{rgb}{0.25,0.5,0.35} % comments |
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28 \definecolor{javapurple}{rgb}{0.5,0,0.35} % keywords |
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29 \definecolor{javadocblue}{rgb}{0.25,0.35,0.75} % javadoc |
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30 |
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31 \lstset{language=Java, |
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32 basicstyle=\ttfamily, |
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33 keywordstyle=\color{javapurple}\bfseries, |
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34 stringstyle=\color{javagreen}, |
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35 commentstyle=\color{javagreen}, |
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36 morecomment=[s][\color{javadocblue}]{/**}{*/}, |
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37 numbers=left, |
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38 numberstyle=\tiny\color{black}, |
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39 stepnumber=1, |
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40 numbersep=10pt, |
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41 tabsize=2, |
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42 showspaces=false, |
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43 showstringspaces=false} |
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44 |
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45 \lstdefinelanguage{scala}{ |
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46 morekeywords={abstract,case,catch,class,def,% |
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47 do,else,extends,false,final,finally,% |
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48 for,if,implicit,import,match,mixin,% |
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49 new,null,object,override,package,% |
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50 private,protected,requires,return,sealed,% |
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51 super,this,throw,trait,true,try,% |
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52 type,val,var,while,with,yield}, |
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53 otherkeywords={=>,<-,<\%,<:,>:,\#,@}, |
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54 sensitive=true, |
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55 morecomment=[l]{//}, |
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56 morecomment=[n]{/*}{*/}, |
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57 morestring=[b]", |
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58 morestring=[b]', |
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59 morestring=[b]""" |
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60 } |
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61 |
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62 \lstset{language=Scala, |
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63 basicstyle=\ttfamily, |
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64 keywordstyle=\color{javapurple}\bfseries, |
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65 stringstyle=\color{javagreen}, |
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66 commentstyle=\color{javagreen}, |
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67 morecomment=[s][\color{javadocblue}]{/**}{*/}, |
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68 numbers=left, |
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69 numberstyle=\tiny\color{black}, |
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70 stepnumber=1, |
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71 numbersep=10pt, |
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72 tabsize=2, |
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73 showspaces=false, |
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74 showstringspaces=false} |
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75 |
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76 % beamer stuff |
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77 \renewcommand{\slidecaption}{Scala, King's College London, 27.~March 2012} |
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78 |
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79 |
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80 \begin{document} |
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81 |
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82 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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83 \mode<presentation>{ |
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84 \begin{frame}<1>[t] |
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85 \frametitle{% |
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86 \begin{tabular}{@ {\hspace{-3mm}}c@ {}} |
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87 \\ |
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88 \large \textcolor{black}{PRA, Programming Applications:}\\[5mm] |
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89 \Huge Scala\\[-1mm] |
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90 \large ``Better Java'' for Programming the JVM\\[5mm] |
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91 \normalsize \textcolor{black}{Christian Urban} |
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92 \end{tabular}} |
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93 \end{frame}} |
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94 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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95 |
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96 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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97 \mode<presentation>{ |
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98 \begin{frame}[c] |
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99 \frametitle{\begin{tabular}{c}1.~Reason\end{tabular}} |
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100 |
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101 \begin{textblock}{6}(1,3) |
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102 \begin{tabular}{l} |
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103 \mbox{}\hspace{-1mm}\includegraphics[scale=0.36]{twitter.png}\\[-1mm] |
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104 \includegraphics[scale=0.30]{linked.png}\\ |
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105 \includegraphics[scale=0.30]{guardian.jpg}\\[-3mm] |
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106 \mbox{}\hspace{-2mm}\includegraphics[scale=0.38]{morgan.png}\\[-3mm] |
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107 \includegraphics[scale=0.30]{suisse.png}\\ |
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108 \includegraphics[scale=0.20]{edf.png}\\[-1mm] |
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109 \includegraphics[scale=0.08]{novell.png}\\[-1mm] |
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110 \includegraphics[scale=0.30]{foursquare.png}\\ |
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111 \includegraphics[scale=0.30]{hsbc.png}\\ |
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112 {\large\bf ...} |
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113 \end{tabular} |
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114 \end{textblock} |
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115 |
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116 \only<2->{ |
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117 \begin{textblock}{6}(6,3) |
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118 \includegraphics[scale=0.35]{jobgraph.png}\\ |
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119 \end{textblock}} |
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120 |
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121 \only<3->{ |
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122 \begin{textblock}{6}(7.3,9.2) |
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123 \begin{tabular}{l} |
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124 \footnotesize 2013: 1$\%$\\[-2mm] |
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125 \footnotesize 2014: 3$\%$\\[-2mm] |
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126 \footnotesize 2015: 9$\%$\\[-2mm] |
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127 \footnotesize 2016: 27$\%$\\[-2mm] |
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128 \footnotesize 2017: 81$\%$\\[-2mm] |
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129 \footnotesize 2018: 243$\%$ \raisebox{-1mm}{\includegraphics[scale=0.02]{smiley.jpg}} |
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130 \end{tabular} |
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131 \end{textblock}} |
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132 |
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133 \only<3->{ |
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134 \begin{textblock}{6}(6,9.5) |
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135 \footnotesize 5 yrs $\begin{cases}\mbox{}\\[1.4cm]\end{cases}$ |
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136 \end{textblock}} |
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137 |
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138 \only<4->{ |
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139 \begin{textblock}{11}(5,14.1) |
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140 \textcolor{gray}{ |
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141 \footnotesize {\bf in London today:} 1 Scala job for every 30 Java jobs;\\[-2mm] |
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142 Scala programmers seem to get up to 20\% better salary} |
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143 \end{textblock}} |
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144 |
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145 \end{frame}} |
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146 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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147 |
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148 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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149 \mode<presentation>{ |
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150 \begin{frame}[c] |
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151 \frametitle{\begin{tabular}{c}2.~Reason\end{tabular}} |
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152 |
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153 \begin{textblock}{11}(1,7) |
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154 \begin{tikzpicture}[scale=1.0] |
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155 %\draw[step=2mm] (-1,-1) grid (10,1); |
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156 \draw[->, line width=2mm] (-0.2,0) -- (11,0); |
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157 \draw[line width=0.8mm] (0,0) -- (0,-0.3); |
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158 \node at (0,-0.5) [black] {\footnotesize 1985}; |
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159 \draw[line width=0.8mm] (2.8,0) -- (2.8,-0.3); |
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160 \node at (2.8,-0.5) [black] {\footnotesize 1992}; |
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161 \draw[line width=0.8mm] (1.2,0) -- (1.2,-0.3); |
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162 \node at (1.2,-0.5) [black] {\footnotesize 1988}; |
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163 \draw[line width=0.8mm] (4.8,0) -- (4.8,-0.3); |
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164 \node at (4.8,-0.5) [black] {\footnotesize 1997}; |
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165 \draw[line width=0.8mm] (6,0) -- (6,-0.3); |
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166 \node at (6,-0.5) [black] {\footnotesize 2000}; |
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167 \draw[line width=0.8mm] (7.6,0) -- (7.6,-0.3); |
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168 \node at (7.6,-0.5) [black] {\footnotesize 2004}; |
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169 \draw[line width=0.8mm] (10.4,0) -- (10.4,-0.3); |
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170 \node at (10.4,-0.5) [black] {\footnotesize 2011}; |
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171 \end{tikzpicture} |
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172 \end{textblock} |
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173 |
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174 \begin{textblock}{5}(1,9) |
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175 \small Basic\\[-1mm] |
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176 Assembler\\ |
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177 \end{textblock} |
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178 \begin{textblock}{5}(2.8,11) |
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179 \small Pascal\\[-1mm] |
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180 C\\ |
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181 \end{textblock} |
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182 \begin{textblock}{5}(4.3,9) |
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183 \small Modula 3\\[-1mm] |
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184 C++\\ |
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185 \end{textblock} |
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186 \begin{textblock}{5}(6.7,9) |
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187 \small $\lambda$Prolog\\ |
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188 \end{textblock} |
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189 \begin{textblock}{5}(8.6,9) |
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190 \small Ocaml\\[-1mm] |
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191 \small SMLj\\[-1mm] |
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192 \small Pizza |
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193 \end{textblock} |
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194 \begin{textblock}{5}(10.6,9) |
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195 \normalsize\bf SML\\[-1mm] |
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196 \end{textblock} |
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197 \begin{textblock}{5}(14,9) |
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198 \small Scala\\ |
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199 \end{textblock} |
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200 \begin{textblock}{5}(13.2,11) |
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201 \small \underline{Future?}\\[0mm] |
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202 \small Python\\[-1mm] |
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203 \small Ruby\\[-1mm] |
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204 \small Javascript\\ |
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205 \end{textblock} |
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206 |
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207 \begin{textblock}{5}(0.2,2) |
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208 \includegraphics[scale=0.30]{punch.jpg}\\ |
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209 \end{textblock} |
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210 \begin{textblock}{5}(0.4,4.5) |
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211 \includegraphics[scale=0.20]{plus4.jpg}\\ |
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212 \end{textblock} |
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213 \begin{textblock}{5}(2.8,2.1) |
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214 \includegraphics[scale=0.15]{robotron.jpg}\\ |
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215 \end{textblock} |
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216 \begin{textblock}{5}(5.0,3.7) |
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217 \includegraphics[scale=0.10]{sparc.jpg}\\ |
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218 \end{textblock} |
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219 \begin{textblock}{5}(8.0,4) |
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220 \includegraphics[scale=0.40]{titanium.jpg}\\ |
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221 \end{textblock} |
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222 \begin{textblock}{5}(12,4.5) |
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223 \includegraphics[scale=0.10]{air.jpg}\\ |
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224 \end{textblock} |
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225 \end{frame}} |
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226 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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227 |
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228 |
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229 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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230 \mode<presentation>{ |
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231 \begin{frame}[c] |
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232 \frametitle{\begin{tabular}{c}Why Scala?\end{tabular}} |
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233 |
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234 \large |
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235 \begin{itemize} |
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236 \item compiles to JVM (.Net \& Android)\bigskip |
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237 \item integrates seamlessly with Java (Swing)\bigskip |
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238 \end{itemize} |
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239 |
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240 \end{frame}} |
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241 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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242 |
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243 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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244 \mode<presentation>{ |
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245 \begin{frame}[c] |
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246 \frametitle{\begin{tabular}{c}Why Scala?\end{tabular}} |
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247 |
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248 \large |
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249 \begin{itemize} |
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250 \item combines {\bf functional} and {\bf object-oriented} programming |
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251 \end{itemize} |
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252 |
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253 \end{frame}} |
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254 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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255 |
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256 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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257 \mode<presentation>{ |
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258 \begin{frame}[c] |
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259 \frametitle{\begin{tabular}{c}Why Scala?\end{tabular}} |
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260 |
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261 |
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262 \begin{itemize} |
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263 \item \large {\bf Actors}:\\ |
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264 \normalsize keep asynchronous concurrency simple |
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265 \end{itemize} |
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266 |
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267 \end{frame}} |
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268 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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269 |
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270 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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271 \mode<presentation>{ |
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272 \begin{frame}[c] |
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273 \frametitle{\begin{tabular}{c}Why Scala?\end{tabular}} |
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274 |
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275 |
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276 \begin{itemize} |
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277 \item \large {\bf Immutability}:\\ |
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278 \normalsize keeps concurrency predictable |
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279 \end{itemize} |
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280 |
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281 \end{frame}} |
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282 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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283 |
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284 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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285 \mode<presentation>{ |
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286 \begin{frame}[c] |
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287 \frametitle{\begin{tabular}{c}Why Scala?\end{tabular}} |
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288 |
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289 |
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290 \begin{itemize} |
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291 \item \large {\bf First-Class Functions}:\\ |
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292 \normalsize powerful idea from functional programming |
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293 \end{itemize} |
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294 |
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295 \end{frame}} |
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296 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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297 |
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298 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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299 \mode<presentation>{ |
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300 \begin{frame}[c] |
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301 \frametitle{\begin{tabular}{c}Why Scala?\end{tabular}} |
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302 |
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303 |
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304 \begin{itemize} |
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305 \item \large {\bf Pattern-Matching}:\\ |
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306 \normalsize ``keeps your needles out of the haystacks'' |
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307 \end{itemize} |
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308 |
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309 \end{frame}} |
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310 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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311 |
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312 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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313 \mode<presentation>{ |
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314 \begin{frame}[t] |
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315 \frametitle{\begin{tabular}{c}Why Scala?\end{tabular}} |
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316 |
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317 |
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318 \begin{itemize} |
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319 \item \large {\bf You can avoid \textcolor{blue}{\texttt{null}}}: |
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320 \end{itemize} |
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321 |
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322 \begin{textblock}{6}(0.5,5) |
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323 \begin{tikzpicture} |
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324 \draw (0,0) node[inner sep=3mm,fill=cream, ultra thick, draw=red, rounded corners=2mm] |
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325 { \begin{minipage}{11cm}\raggedright\small |
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326 ``I call it my billion-dollar mistake. It was the invention of the null reference in |
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327 1965. At that time, I was designing the first comprehensive type system for references in an |
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328 object oriented language (ALGOL W). My goal was to ensure that all use of references should |
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329 be absolutely safe, with checking performed automatically by the compiler. But I couldn't resist |
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330 the temptation to put in a null reference, simply because it was so easy to implement. This has |
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331 led to innumerable errors, vulnerabilities, and system crashes, which have probably caused |
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332 a billion dollars of pain and damage in the last forty years.'' Sir Tony Hoare\end{minipage}}; |
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333 \end{tikzpicture} |
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334 \end{textblock} |
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335 |
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336 \begin{textblock}{5}(11.8,1) |
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337 \includegraphics[scale=0.20]{hoare.jpg}\\ |
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338 \end{textblock} |
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339 |
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340 \end{frame}} |
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341 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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342 |
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343 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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344 \mode<presentation>{ |
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345 \begin{frame}[c] |
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346 \frametitle{\begin{tabular}{c}\texttt{null}\end{tabular}} |
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347 |
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348 \lstset{language=java}\footnotesize |
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349 \texttt{\lstinputlisting{MapJavaTester.java}} |
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350 |
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351 \end{frame}} |
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352 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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353 |
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354 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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355 \mode<presentation>{ |
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356 \begin{frame}[c] |
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357 \frametitle{\begin{tabular}{c}Why Scala?\end{tabular}} |
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358 |
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359 |
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360 \begin{itemize} |
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361 \item \large The Price You Pay with Scala: \textcolor{red}{\bf Complexity}\\ |
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362 \normalsize But it is worth it! |
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363 \end{itemize} |
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364 |
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365 \end{frame}} |
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366 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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367 |
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368 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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369 \mode<presentation>{ |
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370 \begin{frame}[c] |
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371 \frametitle{\begin{tabular}{c}Java: A Brief History\end{tabular}} |
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372 |
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373 \begin{itemize} |
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374 \item Released in 1995 by James Gosling from \\Sun Microsystems (work started in 1991)\medskip |
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375 \item derives much of its syntax from C and C++\medskip |
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376 \item compiles to JVM (``write once, run everywhere'')\medskip |
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377 \item no pointers --- instead automatic memory management (has a garbage collector)\medskip |
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378 \item statically typed\\ (``you cannot compare apples with oranges'') |
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379 \end{itemize} |
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380 |
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381 \begin{textblock}{5}(13,2) |
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382 \includegraphics[scale=0.20]{java.png}\\ |
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383 \end{textblock} |
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384 |
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385 \end{frame}} |
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386 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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387 |
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388 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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389 \mode<presentation>{ |
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390 \begin{frame}[c] |
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391 |
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392 \lstset{language=java}\fontsize{8}{10}\selectfont |
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393 \texttt{\lstinputlisting{FruitMain.java}} |
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394 |
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395 \only<2>{ |
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396 \begin{textblock}{6}(5,5) |
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397 \begin{tikzpicture} |
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398 \draw (0,0) node[inner sep=3mm,fill=cream, ultra thick, draw=red, rounded corners=2mm] |
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399 {\begin{minipage}{8cm}\raggedright\tt\footnotesize |
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400 \begin{tabular}{l} |
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401 FruitMain.java:20:~incompatible types\\ |
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402 found: Orange\\ |
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403 required: Apple\\ |
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404 a = o;\\ |
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405 1 error\\ |
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406 \end{tabular} |
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407 \end{minipage}}; |
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408 \end{tikzpicture} |
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409 \end{textblock}} |
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410 |
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411 |
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412 \end{frame}} |
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413 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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414 |
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415 |
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416 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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417 \mode<presentation>{ |
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418 \begin{frame}[c] |
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419 |
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420 \lstset{language=java}\fontsize{8}{10}\selectfont |
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421 \texttt{\lstinputlisting{FruitArray.java}} |
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422 |
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423 \only<2>{ |
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424 \begin{textblock}{8}(1,5) |
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425 \begin{tikzpicture} |
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426 \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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428 \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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433 \end{tabular} |
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434 \end{minipage}}; |
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435 \end{tikzpicture} |
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436 \end{textblock}} |
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437 |
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438 |
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439 \end{frame}} |
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440 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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441 |
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442 |
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443 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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444 \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} |
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449 \end{itemize} |
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450 |
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451 {\lstset{language=java}\fontsize{8}{10}\selectfont |
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452 \texttt{\lstinputlisting{Student.java}}} |
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453 |
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454 \onslide<2->{ |
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455 \begin{itemize} |
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456 \item {\bf Same in Scala} |
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457 \end{itemize} |
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458 |
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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 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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467 \mode<presentation>{ |
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468 \begin{frame}[c] |
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469 \frametitle{\begin{tabular}{c}Scala\end{tabular}} |
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470 |
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471 \begin{itemize} |
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472 \item First released in 2003 (work started in 2001) by Martin Odersky from EPFL in Lausanne\smallskip |
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473 \item at the moment 2.9.2 (2012)\smallskip |
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474 \item blend of functional and oo-programming\medskip\medskip |
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475 \item Twitter switched in 2009 from Ruby to Scala |
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476 \item Guardian switched in 2011 from Java to Scala |
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477 \item UBS approved it for general production usage (2011) |
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478 \end{itemize} |
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479 |
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480 |
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481 \end{frame}} |
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482 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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483 |
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484 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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485 \mode<presentation>{ |
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486 \begin{frame}[t] |
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487 |
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488 \only<1>{ |
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489 Hello World in Java:\medskip |
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490 {\lstset{language=Java}\fontsize{12}{14}\selectfont |
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491 \texttt{\lstinputlisting{Hello.java}}}} |
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492 \only<2->{ |
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493 Hello World in Scala:\medskip |
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494 {\lstset{language=Scala}\fontsize{12}{14}\selectfont |
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495 \texttt{\lstinputlisting{Hello.scala}}}\bigskip\medskip |
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496 |
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497 |
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498 Some curiosities, compared to Java: |
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499 \begin{itemize} |
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500 \item<3-> The semicolons are missing. |
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501 \item<4-> The {\bf\texttt{public}} access modifier is missing. |
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502 \item<5-> The declaration of main starts with {\bf\texttt{def}}. |
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503 \item<6-> main returns mysterious type {\bf\texttt{Unit}}. |
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504 \item<7-> In Scala there is {\bf\texttt{object}} and {\bf\texttt{class}}. |
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505 \end{itemize}} |
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506 |
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507 |
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508 \end{frame}} |
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509 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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510 |
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511 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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512 \mode<presentation>{ |
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513 \begin{frame}[c] |
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514 |
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515 \begin{center} |
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516 \textcolor{ProcessBlue}{\LARGE\bf Demo} |
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517 \end{center} |
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518 \end{frame}} |
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519 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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520 |
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521 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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522 \mode<presentation>{ |
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523 \begin{frame}[c] |
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524 \frametitle{\begin{tabular}{c}Functions\end{tabular}} |
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525 |
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526 Transformations:\bigskip |
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527 \begin{center} |
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528 \LARGE |
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529 Input(s) $\Rightarrow$ Output\bigskip\bigskip |
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530 \end{center}\pause |
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531 |
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532 ``Given some input; produce some output.''\\ |
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533 ``Transform the input into some output.''\\ |
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534 |
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535 \end{frame}} |
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536 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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537 |
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538 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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539 \mode<presentation>{ |
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540 \begin{frame}[c] |
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541 \frametitle{\begin{tabular}{c}Functions in Scala\end{tabular}} |
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542 |
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543 \mbox{}\bigskip\bigskip\bigskip\bigskip |
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544 {\lstset{language=Scala}\fontsize{12}{14}\selectfont |
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545 \texttt{\lstinputlisting{max.scala}}} |
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546 |
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547 \small |
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548 \begin{textblock}{8}(1,3) |
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549 {\bf\texttt{def}} starts a function definition |
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550 \end{textblock} |
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551 \begin{textblock}{8}(2.3,4) |
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552 function name |
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553 \end{textblock} |
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554 \begin{textblock}{8}(3.8,5) |
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555 parameter list in parentheses |
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556 \end{textblock} |
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557 \begin{textblock}{8}(6.5,6) |
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558 function's result type |
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559 \end{textblock} |
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560 \begin{textblock}{8}(11,7) |
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561 equal sign |
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562 \end{textblock} |
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563 \begin{textblock}{8}(9,10) |
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564 function body\\ |
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565 in curly braces |
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566 \end{textblock} |
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567 |
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568 \end{frame}} |
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569 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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570 |
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571 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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572 \mode<presentation>{ |
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573 \begin{frame}[c] |
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574 |
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575 {\lstset{language=Java}\fontsize{7}{8}\selectfont |
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576 \texttt{\lstinputlisting{URLReader.java}}} |
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577 |
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578 \only<2>{ |
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579 \begin{textblock}{5}(12,2) |
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580 \includegraphics[scale=0.50]{skeleton.jpg}\\ |
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581 \end{textblock}} |
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582 \end{frame}} |
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583 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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584 |
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585 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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586 \mode<presentation>{ |
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587 \begin{frame}[t] |
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588 \frametitle{\begin{tabular}{c}Map\end{tabular}} |
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589 |
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590 \begin{itemize} |
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591 \item {\bf\texttt{map}} takes a function, say f, and applies it to every element of the list: |
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592 \end{itemize} |
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593 |
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594 \begin{textblock}{15}(2,7) |
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595 \fontsize{13}{14}\selectfont |
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596 \bf\texttt{List(1, 2, 3, 4, 5, 6, 7, 8, 9)} |
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597 \end{textblock} |
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598 |
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599 \begin{textblock}{15}(2,10) |
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600 \fontsize{13}{14}\selectfont |
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601 \bf\texttt{List(1, 4, 9, 16, 25, 36, 49, 64, 81)} |
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602 \end{textblock} |
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603 |
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604 \end{frame}} |
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605 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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606 |
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607 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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608 \mode<presentation>{ |
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609 \begin{frame}<1-2>[t] |
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610 \frametitle{\begin{tabular}{c}Filter\end{tabular}} |
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611 |
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612 \begin{itemize} |
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613 \item {\bf\texttt{filter}} takes a condition, say p, and filters out all elements of the list not satisfying p: |
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614 \end{itemize} |
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615 |
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616 \begin{textblock}{15}(2,7) |
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617 \fontsize{13}{14}\selectfont |
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618 \bf\texttt{List(1, 2, 3, 4, 5, 6, 7, 8, 9)} |
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619 \end{textblock} |
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620 |
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621 \end{frame}} |
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622 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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623 |
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624 |
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625 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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626 \mode<presentation>{ |
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627 \begin{frame}[c] |
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628 \frametitle{\begin{tabular}{c}Conclusion\end{tabular}} |
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629 |
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630 \begin{itemize} |
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631 \item Scala is still under development (compiler is slow)\medskip |
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632 \item there are at least 5 books on the market\medskip |
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633 \item {\bf\texttt{http://www.scala-lang.org/}}\medskip |
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634 \item ``deep'' type-system (computer science)\bigskip\pause |
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635 \item (for the lazy programmer)\\ programming in Scala is much more fun |
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636 |
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637 \end{itemize} |
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638 \end{frame}} |
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639 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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640 |
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641 |
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642 \end{document} |
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643 |
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644 %%% Local Variables: |
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645 %%% mode: latex |
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646 %%% TeX-master: t |
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647 %%% End: |
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648 |