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%\usepackage{opensans}          % Can't make this work so far. Shame. Would be lovely.
\usepackage[normalem]{ulem}     % For underlining links
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% 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{dwapi}
\pdfinfo{
  /Title (ruby-enumerable-quick-ref.pdf)
  /Creator (Cheatography)
  /Author (dwapi)
  /Subject (Ruby Enumerable Quick Ref Cheat Sheet)
}

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\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 Enumerable Quick Ref Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{dwapi} via \textcolor{DarkBackground}{\uline{cheatography.com/43665/cs/13023/}}}
\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}dwapi \\
  \uline{cheatography.com/dwapi} \\
  \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 October, 2017.\\
   Updated 17th October, 2017.\\
   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}
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% www.emerson.emory.edu/services/latex/latex_169.html
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\begin{multicols*}{2}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Sorting}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{partition: }} Returns two arrays, the first containing the elements which the block evaluates to true, the second containing the rest.} \tn 
\mymulticolumn{1}{x{8.4cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}(1..6).partition \{ |v| v.even? \}  ~ ~ \# =\textgreater{} {[}{[}2, 4, 6{]}, {[}1, 3, 5{]}{]}} \tn 
% Row Count 5 (+ 5)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\bf{sort\_by:}} Returns array sorted by the return value of the block.} \tn 
\mymulticolumn{1}{x{8.4cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}{[}apple pear fig{]}.sort\_by \{|word| word.length\}  ~ ~ \# =\textgreater{} {[}fig, pear, apple{]}} \tn 
% Row Count 9 (+ 4)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{max and min:}} Returns max/min element based on sorting by \{ |a, b| a \textless{}=\textgreater{} b \}} \tn 
\mymulticolumn{1}{x{8.4cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}{[}fish dog horse{]}.max \{ |a, b| a.length \textless{}=\textgreater{} b.length \}  ~ ~ \# =\textgreater{} "horse"\{\{nl\}\}{[}fish dog horse{]}.max(2) \{|a, b| a.length \textless{}=\textgreater{} b.length ~ ~ \#  =\textgreater{} {[}horse, fish{]}} \tn 
% Row Count 15 (+ 6)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\bf{max\_by and min\_by:}}  Returns element with max/min block return value} \tn 
\mymulticolumn{1}{x{8.4cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}{[}fish dog horse{]}.max\_by \{ |x| x.length \} ~ ~ \# =\textgreater{} "horse"\{\{nl\}\}{[}fish dog horse{]}.max\_by(2) \{|x| x.length \} ~ ~ \# =\textgreater{} {[}horse, fish{]}} \tn 
% Row Count 21 (+ 6)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Searching}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{select and select! }} Returns array of all elements where block returns true} \tn 
\mymulticolumn{1}{x{8.4cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}{[}1,2,3,4,5{]}.select \{ |num| num.even? \} ~ ~ \# =\textgreater{} {[}2, 4{]}} \tn 
% Row Count 4 (+ 4)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\bf{reject and reject! }} Returns array of all elements where block returns FALSE **} \tn 
\mymulticolumn{1}{x{8.4cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}{[}1, 2, 3, 4, 5{]}.reject \{ |num| num.even? \}  ~ ~ \# =\textgreater{} {[}1, 3, 5{]}} \tn 
% Row Count 8 (+ 4)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{grep:}} without block} \tn 
\mymulticolumn{1}{x{8.4cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}{[}1, 'a', 2, 'b'{]}.grep(Integer) ~ ~ \#  =\textgreater{} {[}1,2{]}\{\{nl\}\}{[}dog cat tree doggie{]}.grep(/dog/)  ~ ~\#  =\textgreater{} {[}dog, doggie{]}} \tn 
% Row Count 12 (+ 4)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\bf{grep:}} With Block} \tn 
\mymulticolumn{1}{x{8.4cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}{[}'a', 1, 2, 'b'{]}.grep(String, \&:upcase) \# find strings \& upcase  ~ ~\#=\textgreater{} {[}A, B{]}} \tn 
% Row Count 15 (+ 3)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{index:}} Returns the index of the first object == to value} \tn 
\mymulticolumn{1}{x{8.4cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}{[} "a", "b", "c" {]}index("b")  ~ ~ \# =\textgreater{} 1} \tn 
% Row Count 19 (+ 4)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Iterators}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{reverse\_each}} Same as each but in reverse} \tn 
\mymulticolumn{1}{x{8.4cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}{[}dog cat abc{]}.reverse\_each \{ |word| str += "\#\{word\} " \}~ ~=\textgreater{} abc cat dog} \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\bf{each\_cons }} Iterates the given block for each array of consecutive elements.} \tn 
\mymulticolumn{1}{x{8.4cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}(1..10).each\_cons(3) \{ |a| p a \}\{\{nl\}\}\#outputs:\{\{nl\}\}{[}1, 2, 3{]}\{\{nl\}\}{[}2, 3, 4{]}\{\{nl\}\}{[}3, 4, 5{]} \#etc...} \tn 
% Row Count 8 (+ 5)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{each\_slice}} terates the given block for each slice of elements.} \tn 
\mymulticolumn{1}{x{8.4cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}(1..10).each\_slice(3) \{ |a| p a \}\{\{\{nl\}\}\# outputs below\{\{nl\}\}{[}1, 2, 3{]}\{\{nl\}\}{[}4, 5, 6{]}\{\{nl\}\}{[}7, 8, 9{]}   \#etc...} \tn 
% Row Count 13 (+ 5)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\bf{cycle}} repeats contents} \tn 
\mymulticolumn{1}{x{8.4cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}{[}"a", "b", "c"{]}.cycle \{ |x| puts x \}  \# print, a, b, c, a, b, c,.. forever.\{\{nl\}\}{[}"a", "b", "c"{]}.cycle(2) \{ |x| puts x \} \# print, a, b, c, a, b, c.} \tn 
% Row Count 18 (+ 5)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Misc}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{sample}} Chose a random element or n random elements from array} \tn 
\mymulticolumn{1}{x{8.4cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}{[}1,2,3,4,5,6{]}.sample(3) \# =\textgreater{} {[}5, 6, 2{]}} \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\bf{unshift}} Add to front of array} \tn 
\mymulticolumn{1}{x{8.4cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}{[}2,3,4{]}.unshift(1) \# =\textgreater{} {[}1, 2, 3, 4{]}} \tn 
% Row Count 5 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{shift}} deletes first item from arr} \tn 
\mymulticolumn{1}{x{8.4cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}{[}1, 2, 3, 4, 5{]}.shift \# =\textgreater{} {[}2, 3, 4, 5{]}} \tn 
% Row Count 7 (+ 2)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\bf{pop}} remove the last x items} \tn 
\mymulticolumn{1}{x{8.4cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}{[}1, 2, 3, 4, 5{]}.pop(2)  \# =\textgreater{} {[}4, 5{]}} \tn 
% Row Count 9 (+ 2)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{delete}} delets item passed} \tn 
\mymulticolumn{1}{x{8.4cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}{[}2, 3, 4, 8{]}.delete(8) \# =\textgreater{} {[}2, 3, 4{]}} \tn 
% Row Count 11 (+ 2)
% Row 5
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\bf{clear}} Remove all elements from array} \tn 
\mymulticolumn{1}{x{8.4cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}{[}2,3,4{]}.clear  \# =\textgreater{} {[}{]}} \tn 
% Row Count 13 (+ 2)
% Row 6
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{compact}} remove nils from array} \tn 
\mymulticolumn{1}{x{8.4cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}{[}2,3,nil,4, nil, 8, nil{]}.compact  \# =\textgreater{} {[}2, 3, 4, 8{]}} \tn 
% Row Count 16 (+ 3)
% Row 7
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\bf{uniq}} removes duplicates from arr} \tn 
\mymulticolumn{1}{x{8.4cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}{[}1, 2, 3, 4, 5, 1, 2{]}.uniq \# =\textgreater{} {[}1, 2, 3, 4, 5{]}} \tn 
% Row Count 18 (+ 2)
% Row 8
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{reduce or inject:}} Iterate over a collection of data and perform proc/block} \tn 
\mymulticolumn{1}{x{8.4cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}(5..10).reduce(:+) \# =\textgreater{} 45\{\{nl\}\} longest = {[}cat sheep bear{]}.inject do |memo, word|\{\{nl\}\}~~memo.length \textgreater{} word.length ? memo : word\{\{nl\}\}end\{\{nl\}\}longest \# =\textgreater{} "sheep"} \tn 
% Row Count 24 (+ 6)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Hash Methods}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{delete\_if / keep\_if}} Deletes/keeps every key-value pair from hsh for which block evaluates to true.} \tn 
\mymulticolumn{1}{x{8.4cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}h.delete\_if \{|key, value| key \textgreater{}= "b" \}  ~ ~ \# =\textgreater{} \{"a"=\textgreater{}100\}} \tn 
% Row Count 5 (+ 5)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\bf{has\_key?(key)}}  Returns true if the given key is present in hsh.} \tn 
\mymulticolumn{1}{x{8.4cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}h.has\_key?("a")  ~ ~ \# =\textgreater{} true} \tn 
% Row Count 8 (+ 3)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{has\_value?(value)}}  Returns true if the given value is present in hsh.} \tn 
\mymulticolumn{1}{x{8.4cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}h.has\_value?(200)  ~ ~ \# =\textgreater{} true} \tn 
% Row Count 11 (+ 3)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\bf{invert}} Returns a new hash created by using hsh's values as keys, and the keys as values.} \tn 
\mymulticolumn{1}{x{8.4cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}h.invert ~ ~ \# =\textgreater{} \{100=\textgreater{}"a", 200=\textgreater{}"b", 300=\textgreater{}"c"\}} \tn 
% Row Count 15 (+ 4)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{reject / reject!}} Same as Hash\#delete\_if, but works on (and returns) a copy of the hsh. Equivalent to hsh.dup.delete\_if.} \tn 
\mymulticolumn{1}{x{8.4cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}h.reject \{|key, value| key \textgreater{}= "b" \}  ~ ~ \# =\textgreater{} \{"a"=\textgreater{}100, "c"=\textgreater{}300\}} \tn 
% Row Count 20 (+ 5)
% Row 5
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\bf{select /select!}} Returns a new hash consisting of entries for which the block returns true.} \tn 
\mymulticolumn{1}{x{8.4cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}h.select \{|k,v| k \textgreater{} "a"\} ~ ~ \# =\textgreater{} \{"b" =\textgreater{} 200, "c" =\textgreater{} 300\}} \tn 
% Row Count 24 (+ 4)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{{\bf{Examples above use h = \{ "a" =\textgreater{} 100, "b" =\textgreater{} 200, "c" =\textgreater{} 300 \}}}}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}


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

\end{document}