\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{char1010101010}
\pdfinfo{
  /Title (go.pdf)
  /Creator (Cheatography)
  /Author (char1010101010)
  /Subject (Go 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}{000000}
\definecolor{LightBackground}{HTML}{F7F7F7}
\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 Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{char1010101010} via \textcolor{DarkBackground}{\uline{cheatography.com/183653/cs/38233/}}}
\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}char1010101010 \\
  \uline{cheatography.com/char1010101010} \\
  \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 16th April, 2023.\\
   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*}{2}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{WaitGroups}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{func generateRandomNumber(ch chan\textless{}- int, id int, wg *sync.WaitGroup) \{ \newline     defer wg.Done() \newline  \newline     \seqsplit{rand.Seed(time.Now().UnixNano()} + int64(id)) \newline     randomNumber := rand.Intn(100) \newline  \newline     ch \textless{}- randomNumber \newline \} \newline  \newline func main() \{ \newline     var wg sync.WaitGroup \newline     ch := make(chan int, 100) \newline  \newline     runtime.GOMAXPROCS(3) \newline  \newline     for i := 1; i \textless{}= 100; i++ \{ \newline         wg.Add(1) \newline         go generateRandomNumber(ch, i, \&wg) \newline     \} \newline  \newline     go func() \{ \newline         wg.Wait() \newline         close(ch) \newline     \}() \newline  \newline     for randomNumber := range ch \{ \newline         \seqsplit{fmt.Println(randomNumber)} \newline     \} \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Arrays}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{func mean(tab {[}5{]}int) (meanVal float64) \{ \newline   // for index, value := range collection \newline   for \_, value := range tab \{ \newline     meanVal+= (float64)(value) \newline   \} \newline   meanVal /= (float64)(len(tab)) \newline   return \newline \} \newline  \newline func main() \{ \newline   var table = {[}5{]}int\{3, 4, 8, 9, 2\} \newline   m := mean(table) // pass by value \newline   fmt.Printf("result= \%f\textbackslash{}n", m) \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Maps}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{func main() \{ \newline     m := make(map{[}string{]}int) \newline  \newline     m{[}"k1"{]} = 7 \newline     m{[}"k2"{]} = 13 \newline  \newline     fmt.Println("map:", m) //map: map{[}k1:7 k2:13{]} \newline  \newline     v1 := m{[}"k1"{]} \newline     fmt.Println("v1:", v1) //v1: 7 \newline  \newline     v3 := m{[}"k3"{]} \newline     fmt.Println("v3:", v3) //v3: 0 \newline  \newline     fmt.Println("len:", len(m)) //len: 2 \newline  \newline     delete(m, "k2") \newline     fmt.Println("map:", m) //map: map{[}k1:7{]} \newline  \newline     \_, prs := m{[}"k2"{]} //second return val to see if key is present \newline     fmt.Println("prs:", prs) //prs: false \newline  \newline     n := map{[}string{]}int\{"foo": 1, "bar": 2\} \newline     fmt.Println("map:", n) //map: map{[}bar:2 foo:1{]} \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Method}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{func (pt {\emph{Point) norm() float64 \{ \newline   return math.Sqrt(pt.x}}pt.x + pt.y*pt.y) \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Range}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{for i, num := range nums \{ \newline    fmt.Println("index: ", i, " num: ", num) \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Range}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{for i, num := range nums \{ \newline    fmt.Println("index: ", i, " num: ", num) \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Iota}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{const ( \newline   ON = iota \newline   OFF = iota // optional here \newline   OTHER = iota \newline ) \newline fmt.Println(ON, OFF, OTHER) // Will print: 0 1 2} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Functions as Parameters}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{func main() \{ \newline   a := Point\{2.,4.\} \newline   b := Point\{5.,9.\} \newline   dist := calc(a,b,Distance) \newline   fmt.Printf("result= \%f\textbackslash{}n", dist) \newline   dist = calc(a,b, \newline     func(p Point, q Point)float64\{ \newline       return \seqsplit{math.Abs(p.x-q.x)+math.Abs(p.y-q.y)} \newline   \}) \newline   fmt.Printf("result= \%f\textbackslash{}n", dist) \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Pointers and Structs}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{type Point struct \{ \newline   x int \newline   y int \newline \} \newline  \newline func main() \{ \newline   pt := Point\{8, 1\} \newline   complement(\&pt) \newline   fmt.Printf("Result= \%d and \%d\textbackslash{}n", pt.x , pt.y) \newline \} \newline  \newline func complement(p *Point) \{ \newline   p.x, p.y = -p.y, -p.x \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Slices}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{func main() \{ \newline     s := make({[}{]}string, 3) \newline     fmt.Println("emp:", s) //emp: {[}  {]} \newline  \newline     s{[}0{]} = "a" \newline     s{[}1{]} = "b" \newline     s{[}2{]} = "c" \newline     fmt.Println("set:", s) //set: {[}a b c{]} \newline     fmt.Println("get:", s{[}2{]}) //get: c \newline  \newline     fmt.Println("len:", len(s)) //len: 3 \newline  \newline     s = append(s, "d") \newline     s = append(s, "e", "f") \newline     fmt.Println("apd:", s) //apd: {[}a b c d e f{]} \newline  \newline     c := make({[}{]}string, len(s)) \newline     copy(c, s) \newline     fmt.Println("cpy:", c) //cpy: {[}a b c d e f{]} \newline  \newline     l := s{[}2:5{]} \newline     fmt.Println("sl1:", l) //sl1: {[}c d e{]} \newline  \newline     l = s{[}:5{]} \newline     fmt.Println("sl2:", l) //sl2: {[}a b c d e{]} \newline  \newline     l = s{[}2:{]} \newline     fmt.Println("sl3:", l) //sl3: {[}c d e f{]} \newline  \newline     t := {[}{]}string\{"g", "h", "i"\} \newline     fmt.Println("dcl:", t) //dcl: {[}g h i{]} \newline  \newline     twoD := make({[}{]}{[}{]}int, 3) \newline     for i := 0; i \textless{} 3; i++ \{ \newline         innerLen := i + 1 \newline         twoD{[}i{]} = make({[}{]}int, innerLen) \newline         for j := 0; j \textless{} innerLen; j++ \{ \newline             twoD{[}i{]}{[}j{]} = i + j \newline         \} \newline     \} \newline     fmt.Println("2d: ", twoD) //2d:  {[}{[}0{]} {[}1 2{]} {[}2 3 4{]}{]} \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}


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

\end{document}