\documentclass[10pt,a4paper]{article}

% Packages
\usepackage{fancyhdr}           % For header and footer
\usepackage{multicol}           % Allows multicols in tables
\usepackage{tabularx}           % Intelligent column widths
\usepackage{tabulary}           % Used in header and footer
\usepackage{hhline}             % Border under tables
\usepackage{graphicx}           % For images
\usepackage{xcolor}             % For hex colours
%\usepackage[utf8x]{inputenc}    % For unicode character support
\usepackage[T1]{fontenc}        % Without this we get weird character replacements
\usepackage{colortbl}           % For coloured tables
\usepackage{setspace}           % For line height
\usepackage{lastpage}           % Needed for total page number
\usepackage{seqsplit}           % Splits long words.
%\usepackage{opensans}          % Can't make this work so far. Shame. Would be lovely.
\usepackage[normalem]{ulem}     % For underlining links
% Most of the following are not required for the majority
% of cheat sheets but are needed for some symbol support.
\usepackage{amsmath}            % Symbols
\usepackage{MnSymbol}           % Symbols
\usepackage{wasysym}            % Symbols
%\usepackage[english,german,french,spanish,italian]{babel}              % Languages

% Document Info
\author{Simon Fermor (Simon Fermor)}
\pdfinfo{
  /Title (ruby-essentials-for-kids.pdf)
  /Creator (Cheatography)
  /Author (Simon Fermor (Simon Fermor))
  /Subject (Ruby Essentials for Kids Cheat Sheet)
}

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% This two commands together give roughly
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% Commands
\newcommand{\SetRowColor}[1]{\noalign{\gdef\RowColorName{#1}}\rowcolor{\RowColorName}} % Shortcut for row colour
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% Header and Footer
\pagestyle{fancy}
\fancyhead{} % Set header to blank
\fancyfoot{} % Set footer to blank
\fancyhead[L]{
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{C}
    \SetRowColor{DarkBackground}
    \vspace{-7pt}
    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
    }
\end{tabulary}
\columnbreak
\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{Ruby Essentials for Kids Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{Simon Fermor (Simon Fermor)} via \textcolor{DarkBackground}{\uline{cheatography.com/1330/cs/4499/}}}
\end{tabulary}
\end{multicols}}

\fancyfoot[L]{ \footnotesize
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{LL}
  \SetRowColor{FootBackground}
  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}Simon Fermor (Simon Fermor) \\
  \uline{cheatography.com/simon-fermor} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Published 4th July, 2015.\\
   Updated 10th May, 2016.\\
   Page {\thepage} of \pageref{LastPage}.
\end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Sponsor}}  \\
  \SetRowColor{white}
  \vspace{-5pt}
  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
\end{tabulary}
\end{multicols}}




\begin{document}
\raggedright
\raggedcolumns

% Set font size to small. Switch to any value
% from this page to resize cheat sheet text:
% www.emerson.emory.edu/services/latex/latex_169.html
\footnotesize % Small font.

\begin{multicols*}{3}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Command Line}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{From the command prompt run Ruby, providing the name of a file with source code: \newline % Row Count 2 (+ 2)
\$ ruby my\_source-code.rb% Row Count 3 (+ 1)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Interactive Ruby}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{The Interactive Ruby Shell can be used for interactive programming: \newline % Row Count 2 (+ 2)
\$ irb \newline % Row Count 3 (+ 1)
\textgreater{}\textgreater{}% Row Count 4 (+ 1)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Loading files}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{In IRB, files can be loaded using the load command: \newline % Row Count 2 (+ 2)
\textgreater{}\textgreater{} load 'script\_name.rb'% Row Count 3 (+ 1)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Input}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{gets gets a string e.g.: \newline % Row Count 1 (+ 1)
direction = gets.chomp% Row Count 2 (+ 1)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Indentation}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Useful but not necessary.% Row Count 1 (+ 1)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{If / Else Loops}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{if my\_variable\_is\_true \&\& \seqsplit{my\_other\_variable\_is\_true} \newline   dosomething \newline elseif !my\_next\_variable\_is\_false \newline   dosomethingelse \newline else \newline   dothis \newline end} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{for loop - next}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{next skips to the next element% Row Count 1 (+ 1)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Unless}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{unless my\_variable\_is\_true \newline   \# dosomething \newline end} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Console output}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Use puts to display output.% Row Count 1 (+ 1)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.04057 cm} x{2.93643 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Object methods}}  \tn
% Row 0
\SetRowColor{LightBackground}
object\_id & The object ID \tn 
% Row Count 1 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.74195 cm} x{3.23505 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Data Types}}  \tn
% Row 0
\SetRowColor{LightBackground}
Boolean & true or false \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{numbers} \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
strings & ' or " quoted \tn 
% Row Count 3 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{0.4977 cm} p{0.4977 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Number methods}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{odd} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{even} \tn 
% Row Count 2 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{0.74655 cm} x{4.23045 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{String Methods}}  \tn
% Row 0
\SetRowColor{LightBackground}
* & Repeat string \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\seqsplit{length} & Number of characters in the string \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\seqsplit{reverse} & A string with characters listed in reverse \tn 
% Row Count 4 (+ 2)
% Row 3
\SetRowColor{white}
\seqsplit{to\_sym} & Convert to symbol \tn 
% Row Count 5 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{String Interpolation}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Can be used to insert variable values in a double quoted string: \newline % Row Count 2 (+ 2)
"String with interpolation: \#\{variable\_name\}"% Row Count 3 (+ 1)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{1.04517 cm} x{3.93183 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Operators}}  \tn
% Row 0
\SetRowColor{LightBackground}
+ & 2+2 \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
- & 5-3 \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
* & 5*3 \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
/ & 8/2 \tn 
% Row Count 4 (+ 1)
% Row 4
\SetRowColor{LightBackground}
next & The next number \tn 
% Row Count 5 (+ 1)
% Row 5
\SetRowColor{white}
pred & The predecessor \tn 
% Row Count 6 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{1.9908 cm} p{2.9862 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Logical Operators}}  \tn
% Row 0
\SetRowColor{LightBackground}
\&\& & and \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
|| & or \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
! & not \tn 
% Row Count 3 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{0.4977 cm} x{4.4793 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Comparison operators}}  \tn
% Row 0
\SetRowColor{LightBackground}
\textless{} & less than \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\textgreater{} & greater than \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\textless{}= & less than or equal to \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
\textgreater{}= & greater than or equal to \tn 
% Row Count 4 (+ 1)
% Row 4
\SetRowColor{LightBackground}
!= & not equal to \tn 
% Row Count 5 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Ranges}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{.. from first to last \newline % Row Count 1 (+ 1)
... from first to predecessor before last% Row Count 2 (+ 1)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Symbols}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Created using : \newline % Row Count 1 (+ 1)
eg string\_test = :test\_symbol \newline % Row Count 2 (+ 1)
More efficient than strings - only stored once% Row Count 3 (+ 1)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{1.54287 cm} x{3.43413 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Symbol methods}}  \tn
% Row 0
\SetRowColor{LightBackground}
to\_s & To string \tn 
% Row Count 1 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Arrays}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Described in {[}{]} with items delimited by commas: \newline % Row Count 1 (+ 1)
meal = {[}'breakfast', 'lunch', 'dinner'{]}% Row Count 2 (+ 1)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{0.89586 cm} x{4.08114 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Array methods}}  \tn
% Row 0
\SetRowColor{LightBackground}
new & Create an array \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\textless{}\textless{} & Append to the end of an array \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
empty? & Is array empty \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
shift & Remove front element from array \tn 
% Row Count 4 (+ 1)
% Row 4
\SetRowColor{LightBackground}
\seqsplit{unshift} & Add new element at front of array \tn 
% Row Count 6 (+ 2)
% Row 5
\SetRowColor{white}
pop & Remove element from end of array \tn 
% Row Count 7 (+ 1)
% Row 6
\SetRowColor{LightBackground}
push & Add element to end of array \tn 
% Row Count 8 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Array loop}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{for my\_placeholder in my\_array \newline   next if something\_is\_true \newline   do\_something \newline end} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Array loop example 2}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{my\_array.each do |my\_placeholder| \newline   next if something\_is\_true \newline   do\_something \newline end} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Array loop example 3}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{my\_array.each \{ |my\_placeholder| next if something\_is\_true do\_something \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Hashes}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Contain key value pairs.  Can use symbols for keys.% Row Count 2 (+ 2)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{3.33459 cm} x{1.64241 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Hash methods}}  \tn
% Row 0
\SetRowColor{LightBackground}
has\_key? & Has the key \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
has\_value? & Has the value \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
my\_hash{[}:my\_key{]} = my\_value & Set has value \tn 
% Row Count 4 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{References}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Ruby Wizardry by Eric Weinstein% Row Count 1 (+ 1)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Defining Methods}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{def my\_method(argument\_1,  \newline       argument\_with\_default = 1,  \newline       *splat\_argument) \newline   \# method body \newline   \# use return keyword to return a value \newline   \# better practice to omit return keyword \newline   puts "argument\_1:  \#\{argument\_1\}" \newline   puts \seqsplit{"argument\_with\_default:} \#\{argument\_with\_default\}" \newline   return splat.length \newline end} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Yield in Blocks}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{The yield keyword is used to invoke a calling block from within a method.  Control is passed back to the method after the block has been invoked.% Row Count 3 (+ 3)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}


% That's all folks
\end{multicols*}

\end{document}