\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{tahir24434}
\pdfinfo{
  /Title (golang.pdf)
  /Creator (Cheatography)
  /Author (tahir24434)
  /Subject (GoLang Cheat Sheet)
}

% Lengths and widths
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\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}{5A7EA3}
\definecolor{LightBackground}{HTML}{F4F6F9}
\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{GoLang Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{tahir24434} via \textcolor{DarkBackground}{\uline{cheatography.com/67694/cs/24941/}}}
\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}tahir24434 \\
  \uline{cheatography.com/tahir24434} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Published 10th November, 2020.\\
   Updated 6th March, 2021.\\
   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}{Packages}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{Packages in Go supports modularity, encapsulation, separate compilation, and reuse.} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{Package declaration at top of every source file} \tn 
% Row Count 3 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{Standalone executables program are in package main} \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{If an entity is declared within a function, it is local to that function.} \tn 
% Row Count 7 (+ 2)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{If declared outside of a function, however, it is visible in all files of the package to which it belongs} \tn 
% Row Count 10 (+ 3)
% Row 5
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{The case of the first letter of a name determines its visibility across package boundaries.} \tn 
% Row Count 12 (+ 2)
% Row 6
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{~~ Upper case identifier: Exported i.e visible and accessible outside of its own package.} \tn 
% Row Count 15 (+ 3)
% Row 7
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{~~ Lower case identifier: private (not accessible from other packages)} \tn 
% Row Count 17 (+ 2)
\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}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{var x int = 11} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{/* \{\{nl\}\} *int is integerPointer type. \{\{nl\}\}  'p' will contain the address of an integer variable. \{\{nl\}\} You can also say that p points to an int variable. \{\{nl\}\} */  \{\{nl\}\} var p *int} \tn 
% Row Count 5 (+ 4)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{// Expression \&var (address of var) yields a pointer to a variable. \{\{nl\}\} p = \&x     // will contain address of x} \tn 
% Row Count 8 (+ 3)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{// Expression *p points to the variable whose address p contains. *p is an alias for x. \{\{nl\}\} fmt.Println(*p)} \tn 
% Row Count 11 (+ 3)
\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
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{Arrays and Structs are aggregate type \{\{nl\}\} Arrays are homogeneous \{\{nl\}\} Array is fixed length sequence of zero or more elements of particular type.} \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{var a{[}3{]} int              ~~~~~~~// Array of 3 integers} \tn 
% Row Count 5 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{var a{[}3{]}int = {[}3{]}int\{1, 2, 3\} // use an array literal to initialize an array with a list of values} \tn 
% Row Count 7 (+ 2)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{a{[}len(a)-1{]}           ~~~~~~~ // Print last element} \tn 
% Row Count 9 (+ 2)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{q := {[}...{]}int\{1, 2, 3\}  // with ellipsis ... , array length is determined by the number of initializer} \tn 
% Row Count 12 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Naming Convention}}  \tn
% Row 0
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\mymulticolumn{1}{x{8.4cm}}{// a name begins with a letter or an underscore and may have any number of additional letters, digits, and underscores} \tn 
% Row Count 3 (+ 3)
% Row 1
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\mymulticolumn{1}{x{8.4cm}}{type playerScore struct      // Use CamelCase} \tn 
% Row Count 5 (+ 2)
% Row 2
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\mymulticolumn{1}{x{8.4cm}}{const MaxTime int} \tn 
% Row Count 6 (+ 1)
% Row 3
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\mymulticolumn{1}{x{8.4cm}}{var fileClosed bool // Use the complete words in larger scopes} \tn 
% Row Count 8 (+ 2)
% Row 4
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\mymulticolumn{1}{x{8.4cm}}{var arg {[}{]}string // Use fewer letters in smaller scopes} \tn 
% Row Count 10 (+ 2)
% Row 5
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\mymulticolumn{1}{x{8.4cm}}{var localAPI string   // Use All caps for acronym} \tn 
% Row Count 12 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Declarations}}  \tn
% Row 0
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\mymulticolumn{1}{x{8.4cm}}{There are four major kinds of declarations: {\bf{ var, const, type, func }}} \tn 
% Row Count 2 (+ 2)
% Row 1
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\mymulticolumn{1}{x{8.4cm}}{{\bf{ var }}} \tn 
% Row Count 3 (+ 1)
% Row 2
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\mymulticolumn{1}{x{8.4cm}}{var name type = expression \{\{nl\}\} // Either the type or the =expression part may be omitted, but not  both \{\{nl\}\} // If the type is omitted, it is determined by the initializer expression. \{\{nl\}\} If the expression is omitted, the initial value is the zero value for the type, which is 0 for numbers, false for booleans.} \tn 
% Row Count 10 (+ 7)
% Row 3
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\mymulticolumn{1}{x{8.4cm}}{var foo int = 42  // declare and init. var name type = expression} \tn 
% Row Count 12 (+ 2)
% Row 4
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\mymulticolumn{1}{x{8.4cm}}{var sep string  ~ ~~~ ~ ~ ~         // implicit initialize} \tn 
% Row Count 14 (+ 2)
% Row 5
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\mymulticolumn{1}{x{8.4cm}}{s, sep := "", ""    ~~~ ~ ~ ~ ~ // Short variable declaration. name := expression} \tn 
% Row Count 17 (+ 3)
% Row 6
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\mymulticolumn{1}{x{8.4cm}}{p := new(int) // p, of type *int, points to an unnamed int variable \{\{nl\}\} // new(T) creates unnamed variable of type T, initialize it to the zero value of T and returns its address.} \tn 
% Row Count 21 (+ 4)
% Row 7
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\mymulticolumn{1}{x{8.4cm}}{{\bf{ const }}} \tn 
% Row Count 22 (+ 1)
% Row 8
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\mymulticolumn{1}{x{8.4cm}}{A constant is an identifier for a fixed value. The value of a variable can vary, but the value of a constant must remain constant.} \tn 
% Row Count 25 (+ 3)
% Row 9
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{const constant = "This is a constant"} \tn 
% Row Count 26 (+ 1)
% Row 10
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\mymulticolumn{1}{x{8.4cm}}{const a float64 = 3.14} \tn 
% Row Count 27 (+ 1)
% Row 11
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{{\bf{ Function Declaration }}} \tn 
% Row Count 28 (+ 1)
% Row 12
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{A function declaration has a name, a list of parameters, an optional list of results} \tn 
% Row Count 30 (+ 2)
\end{tabularx}
\par\addvspace{1.3em}

\vfill
\columnbreak
\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Declarations (cont)}}  \tn
% Row 13
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{// function with params \{\{nl\}\} func getFullName(firstName string, lastName string) \{\}} \tn 
% Row Count 2 (+ 2)
% Row 14
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{// Multiple params of the same type \{\{nl\}\} func getFullName(firstName, lastName string) \{\}} \tn 
% Row Count 4 (+ 2)
% Row 15
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{// Can return type declaration \{\{nl\}\} func getId() int} \tn 
% Row Count 6 (+ 2)
% Row 16
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{// Can return multiple values at once \{\{nl\}\} func person() (int, string) \{ \{\{nl\}\}   ~  return 23, "vinay" \{\{nl\}\}\}} \tn 
% Row Count 9 (+ 3)
% Row 17
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{// Can return multiple named results  \{\{nl\}\} func person() (age int, name string) \{   \{\{nl\}\}  ~ age = 23     name = "vinay"     \{\{nl\}\} ~ return \{\{nl\}\} \} \{\{nl\}\} var age, name = person()} \tn 
% Row Count 13 (+ 4)
% Row 18
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{// Can return function \{\{nl\}\}  func person() func() (string,string) \{   \{\{nl\}\}  ~  area:=func() (string,string) \{     \{\{nl\}\}  ~  ~~   return "street", "city"    \{\{nl\}\}   ~ \}       \{\{nl\}\}  return area \{\{nl\}\}  \}} \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}{Loops}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{// There only for, no while, no until} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{for i := 1; i \textless{} len(os.Args); i++ \{\}  ~ // initialization; condition; post \{\}} \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{for condition \{\}     ~~~~~ // While loop} \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{//  'range' produces a pair of values: the index and the value of the element at that index. '\_' is called blank identifier. \{\{nl\}\} for \_, arg := range os.Args{[}1:{]}} \tn 
% Row Count 9 (+ 4)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}


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

\end{document}