\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{litoblee}
\pdfinfo{
  /Title (ruby.pdf)
  /Creator (Cheatography)
  /Author (litoblee)
  /Subject (Ruby Cheat Sheet)
}

% Lengths and widths
\addtolength{\textwidth}{6cm}
\addtolength{\textheight}{-1cm}
\addtolength{\hoffset}{-3cm}
\addtolength{\voffset}{-2cm}
\setlength{\tabcolsep}{0.2cm} % Space between columns
\setlength{\headsep}{-12pt} % Reduce space between header and content
\setlength{\headheight}{85pt} % If less, LaTeX automatically increases it
\renewcommand{\footrulewidth}{0pt} % Remove footer line
\renewcommand{\headrulewidth}{0pt} % Remove header line
\renewcommand{\seqinsert}{\ifmmode\allowbreak\else\-\fi} % Hyphens in seqsplit
% This two commands together give roughly
% the right line height in the tables
\renewcommand{\arraystretch}{1.3}
\onehalfspacing

% Commands
\newcommand{\SetRowColor}[1]{\noalign{\gdef\RowColorName{#1}}\rowcolor{\RowColorName}} % Shortcut for row colour
\newcommand{\mymulticolumn}[3]{\multicolumn{#1}{>{\columncolor{\RowColorName}}#2}{#3}} % For coloured multi-cols
\newcolumntype{x}[1]{>{\raggedright}p{#1}} % New column types for ragged-right paragraph columns
\newcommand{\tn}{\tabularnewline} % Required as custom column type in use

% Font and Colours
\definecolor{HeadBackground}{HTML}{333333}
\definecolor{FootBackground}{HTML}{666666}
\definecolor{TextColor}{HTML}{333333}
\definecolor{DarkBackground}{HTML}{A3A3A3}
\definecolor{LightBackground}{HTML}{F3F3F3}
\renewcommand{\familydefault}{\sfdefault}
\color{TextColor}

% 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 Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{litoblee} via \textcolor{DarkBackground}{\uline{cheatography.com/19693/cs/2671/}}}
\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}litoblee \\
  \uline{cheatography.com/litoblee} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Not Yet Published.\\
   Updated 13th 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*}{4}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{Three Basic Data Types}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{3.833cm}}{my\_num = 25 \#numbers \newline % Row Count 1 (+ 1)
my\_boolean = true \#Booleans \newline % Row Count 2 (+ 1)
my\_string = "Ruby" \#Strings% Row Count 3 (+ 1)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{Loop and Next}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{3.833cm}}{i = 0 \newline loop do  \newline i += 1 \newline next if i \% 2 == 1 \newline puts "\#\{i\}" \newline break if i == 10 \newline end} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{upto}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{3.833cm}}{95.upto(100) \{ |num| print num, " " \} \newline =\textgreater{} 95 96 97 98 99 100 \newline  \newline "L".upto("P") \{ |letter| print letter, " " \} \newline =\textgreater{} L M N O P} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{Proc}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{3.833cm}}{multiples\_of\_3 = Proc.new do |n| \newline n \% 3 == 0 \newline end \newline  \newline (1..10).to\_a.select(\&multiples\_of\_3) \newline \#==\textgreater{} {[}3, 6, 9{]}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{users string. (converts "s" to "th")}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{3.833cm}}{if user\_input.include? "s" \newline user\_input.gsub!(/s/, "th") \newline else  \newline puts "Nothing to do here!" \newline end} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{use a splat argument}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{3.833cm}}{def whats\_up(greeting, *bros) \newline bros.each \{ |bro| puts "\#\{greetings\}, \#\{bro\}!" \} \newline end \newline  \newline what\_up("What up", "Justin", "Ben", "Kevin Sorbo")} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{use .respond\_to}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{3.833cm}}{{[}1, 2, 3{]}.respond\_to?(:push) \newline % Row Count 1 (+ 1)
would return true, since you can call .push on an array object.  \newline % Row Count 3 (+ 2)
{[}1, 2, 3{]}.respond\_to?(:to\_sym) \newline % Row Count 4 (+ 1)
would return false, since you can't turn an array into a symbol.% Row Count 6 (+ 2)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{Array to string}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{3.833cm}}{numbers\_array = {[}1, 2, 3, 4, 5, 6, 7, 8, 9, 10{]} \newline  \newline strings\_array = \seqsplit{numbers\_array.map(\&:to\_s)}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{Use a counter and Until Loop to count to ten}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{3.833cm}}{counter = 1 \newline until counter == 11 \newline puts counter \newline counter = counter + 1 \newline end} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{combined comparison operator}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{3.833cm}}{It's \textless{}=\textgreater{}. It returns 0 if the first operand (item to be compared) equals the second, 1 if first operand is greater than the second, and -1 if the first operand is less than the second.% Row Count 4 (+ 4)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{Collect}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{3.833cm}}{fibs = {[}1, 1, 2, 3, 5, 8, 13, 21, 34, 55{]} \newline doubled\_fibs = fibs.collect \{ |n| n * 2 \} \newline  \newline \#==\textgreater{}{[}2, 2, 4, 6, 10, 16, 26, 42, 68, 110{]}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{Lambda}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{3.833cm}}{lam = lambda \{ |x| puts x*2 \} \newline {[}1,2,3{]}.each(\&lam) \newline  \newline lam = lambda \{ puts "Hello World" \} \newline lam.call} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{inclusive and exclusive ranges}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{3.833cm}}{for num in 1..10 \#includes 10 \newline % Row Count 1 (+ 1)
for num in 1...10 \#excludes 10% Row Count 2 (+ 1)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{Select}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{3.833cm}}{movie\_ratings = \{ \newline primer: 3.5, \newline the\_matrix: 5, \newline uhf: 1, \newline \} \newline  \newline good\_movies = movie\_ratings.select \{ |k, v| v \textgreater{} 3 \} \newline  \newline =\textgreater{} \{:primer=\textgreater{}3.5, :the\_matrix=\textgreater{}5\}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{3.833cm}}{\bf\textcolor{white}{Yield}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{3.833cm}}{def yield\_name(name) \newline puts "In the method! Let's yield." \newline yield("Kim") \newline puts "In between the yields!" \newline yield(name) \newline puts "Block complete! Back in the method." \newline end \newline  \newline yield\_name("Scott") \{ |n| puts "My name is \#\{n\}" \} \newline  \newline \#==\textgreater{} \newline In the method! Let's yield. \newline My name is Kim \newline In between the yields! \newline My name is Scott \newline Block complete! Back in the method.} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}


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

\end{document}