\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{Gordon Mickel (guiltylemon)}
\pdfinfo{
  /Title (go-lang.pdf)
  /Creator (Cheatography)
  /Author (Gordon Mickel (guiltylemon))
  /Subject (Go Lang 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{Go Lang Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{Gordon Mickel (guiltylemon)} via \textcolor{DarkBackground}{\uline{cheatography.com/20161/cs/3006/}}}
\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}Gordon Mickel (guiltylemon) \\
  \uline{cheatography.com/guiltylemon} \\
  \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 12th 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}{Deklarationen}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{var foo int // Ohne Initialisierung \newline var foo int = 42 // Mit Initialisierung \newline var foo, bar int = 42, 1302 // Mehrere \newline var foo = 42 // Typinferenz \newline foo := 42 // Kurzform, immer implizit \newline const constant = "This is a constant"} \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}{Loops}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{for i := 1; i \textless{} 10; i++ \{...\} \newline     for ; i \textless{} 10;  \{...\} // while - loop \newline     for i \textless{} 10  \{...\} // Semikolons nicht n{\"o}tig \newline     for \{...\} // while (true)} \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}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{if x \textgreater{} 0 \{ \newline         return x \newline     \} else \{ \newline         return -x \newline     \} \newline  \newline     if a := b + c; a \textless{} 42 \{ \newline         return a \newline     \} else \{ \newline         return a - 42 \newline     \}} \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}{Arrays}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{var a {[}10{]}int // int array mit 10 Elementen \newline a{[}3{]} = 42     // setzen \newline i := a{[}3{]}     // auslesen \newline  \newline // Deklarieren \newline a := {[}2{]}int\{1, 2\} \newline a := {[}...{]}int\{1, 2\} // Kompilierer findet die Anzahl Elemente automatisch} \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}{Structs}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{type Man struct \{ \newline     name    string \newline     age     int \newline \} \newline func main() \{ \newline     man1 := Man\{"Ariel", 26\} \newline     man2 := Man \{ \newline         age: 24, \newline         name: "Ben", \newline     \} \newline     //Zugriff auf structs \newline     for \_, man := range {[}{]}Man \{man1, man2\} \{ \newline             println(man.name) \newline     \} \newline \}} \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}{Slices}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{var a {[}{]}int // Slice deklarieren, {\"a}hnlich wie Array aber ohne L{\"a}nge \newline var a = {[}{]}int \{1, 2, 3, 4\} // Slice deklarieren und initialisieren \newline a := {[}{]}int\{ 1, 2, 3, 4 \} // shorthand \newline  \newline var b = a{[}lo:hi{]} // slice kreiieren (view of array) von index lo bis hi-1 \newline var b = a{[}1:4{]} // slice von index 1 to 3 \newline var b = a{[}:3{]} // ohne unterer index impliziert 0 \newline var b = a{[}3:{]} // ohne oberer index impliziert len(a) \newline  \newline // Mit make Slices kreiieren \newline a = make({[}{]}byte, 5, 5) // 1. Paramenter: L{\"a}nge, 2. Parameter: Kapazit{\"a}t = make({[}{]}byte, 5) // Kapazit{\"a}t ist optional} \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}{Funktionen}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{func functionName() \{\} \newline func functionName(param1 string, param2 int) \{\} \newline // parameter mit dem gleichen Typ \newline func functionName(param1, param2 int) \{\} \newline // Rückgabewert \newline func functionName() (int) \{ \newline     return 42 \newline \} \newline // Mehrere Rückgabewerte \newline func returnMulti() (int, string) \{ \newline     return 42, "foobar" \newline \}} \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}{Coroutines}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{import( \newline     t "time" \newline     f "fmt" \newline ) \newline func say(s string) \{ \newline     for i := 0; i \textless{} 5; i++ \{ \newline         t.Sleep(100 * t.Millisecond) \newline         f.Println(s) \newline     \} \newline \} \newline func main() \{ \newline     go say("world") \newline     say("hello") \newline \}} \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}{Channels}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{func seq(num int, c chan int) \{ \newline     x, y := 0, 1 \newline     for num != 0 \{ \newline         x, y = y, x + y \newline         num-{}- \newline     \} \newline     c \textless{}-x \newline \} \newline func main() \{ \newline     //channels müssen vor ihrer Anwendung deklariert werden \newline     ch := make(chan int) \newline     go seq(50, ch) \newline     go seq(20, ch) \newline     res1, res2 := \textless{}-ch, \textless{}-ch \newline     println(res1, res2) //12586269025 6765 \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}


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

\end{document}