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%Information to be included in the title page:
\title{Yourself}
\subtitle{}
\author{Damien Cassou, Stéphane Ducasse and Luc Fabresse}
\institute{http://stephane.ducasse.free.fr}
\date{}
\slidesid{W2S10}

\begin{document}

\frame[plain]{\titlepage}



\begin{frame}[fragile]

\frametitle{A Puzzle and Candidate for Cascade}

We add 2 to a set

\begin{listing}{}
Set new add: 2
> 2
\end{listing}

We get 2 and not the set!
\end{frame}



\begin{frame}[fragile]

\frametitle{Why?}

\begin{listing}{}
Set>>add: newObject
   "Include newObject as one of the receiver's elements, but only if not already present. Answer newObject."
   [...]
   ^ newObject
\end{listing}

\begin{itemize}
\item The method \code{add:} returns its argument, not the receiver
\end{itemize}

\begin{listing}{}
Set new add: 2
> 2
\end{listing}
\end{frame}



\begin{frame}[fragile]

\frametitle{A Verbose Solution}

To get the collection back, we can use a temporary variable

\begin{listing}{}
   | s |
   s := Set new.
   s add: 2.
   s
\end{listing}
\end{frame}



\begin{frame}[fragile]

\frametitle{yourself}

\begin{listing}{}
Object >> yourself
   ^ self
\end{listing}

\begin{listing}{}
Set new
   add: 2;
   yourself
> aSet
\end{listing}

\begin{itemize}
\item \code{add:} and \code{yourself} are sent to the new \code{Set}
\item the cascade (;) returns the returned value of \code{yourself}
\end{itemize}
\end{frame}



\begin{frame}[fragile]

\frametitle{Another Idiom}

\begin{listing}{}
Set class >> with: anObject
   "Answer an instance of me containing anObject."
   | instance |
   instance := self new.
   instance add: anObject.
   ^ instance
\end{listing}

is equivalent to

\begin{listing}{}
Set class >> with: anObject
   "Answer an instance of me containing anObject."
   ^ self new
      add: anObject;
      yourself
\end{listing}

Using \code{yourself} makes sure the code returns the new instance
\end{frame}



\begin{frame}[fragile]

\frametitle{What You Should Know}

\begin{itemize}
\item Some simple methods are powerful
\item Cascade \code{;} and \code{yourself} often go together
\end{itemize}
\end{frame}




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\centering
\large


\vspace{2em}

A course by

\vspace{1em}

\hspace{-20px}\includegraphics[height=32px]{inriaLogo}\hspace{3em}\raisebox{7px}{and}\hspace{3em}\raisebox{-6px}{\includegraphics[height=30px]{logoutop}}

\vspace{2em}

in collaboration with

\vspace{1em}

\includegraphics[height=40px]{unisciellogo}\hskip 1.5em%
\raisebox{5px}{\includegraphics[height=30px]{unitlogo}}\hskip 2em%
\raisebox{8px}{\includegraphics[height=24px]{univLilleLogo}}\hskip 2em%
\raisebox{3px}{\includegraphics[height=29px]{logo-IMT}}\hskip 2em%
\raisebox{1px}{\includegraphics[height=32px]{minesDouaiLogo}}

\vspace{2.5em}

\includegraphics[width=50px]{by-nc-nd} \tiny \hskip 0.5em \raisebox{5px}{Inria 2016}

\medskip

\tiny
Except where otherwise noted, this work is licensed under CC BY-NC-ND 3.0 France

\url{https://creativecommons.org/licenses/by-nc-nd/3.0/fr/} 

\end{minipage}
\end{frame}

\end{document}

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