\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{softmaniac}
\pdfinfo{
  /Title (javascript-tricks.pdf)
  /Creator (Cheatography)
  /Author (softmaniac)
  /Subject (Javascript Tricks Cheat Sheet)
}

% Lengths and widths
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\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
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\definecolor{FootBackground}{HTML}{666666}
\definecolor{TextColor}{HTML}{333333}
\definecolor{DarkBackground}{HTML}{A3D1FF}
\definecolor{LightBackground}{HTML}{E8F3FF}
\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{Javascript Tricks Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{softmaniac} via \textcolor{DarkBackground}{\uline{cheatography.com/62043/cs/15971/}}}
\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}softmaniac \\
  \uline{cheatography.com/softmaniac} \\
  \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 2nd June, 2018.\\
   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}{spread, rest, destructuring...}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{const {[}, host{]} = id.split('@') \newline ` ` \newline let {[}a, b{]} = {[}0, 1{]} \newline ` ` \newline const \{ a \} = \{ a: 3 \} // a = 3 \newline ` ` \newline let {[}first{]} = {[}0, 1{]} // \_.first \newline ` ` \newline const \{realName: alias\} = \{realName: 2\} // alias === 2 \newline ` ` \newline function verifyUser(\{ realName: alias \}) \{ // using alias \} \newline ` ` \newline function defaults(\{ a, b \} = \{ a: 1, b: 2 \}) \{\} \newline ` ` \newline {[}a, b{]} = {[}b, a{]} // swap \newline ` ` \newline // Pass to function that expects separate multiple arguments \newline // Much like \seqsplit{Function.prototype.apply()} does \newline let numbers = {[}9, 4, 7, 1{]}; \newline Math.min(...numbers); // 1 \newline ` ` \newline {[}...document.querySelectorAll('div'){]} // NodeList to Array \newline ` ` \newline {[}...arguments{]} // function arguments to array \newline function logArguments(...args) \{\} // another way \newline ` ` \newline let user = \{ first: "chris",  last: "burgin" \} \newline let userCopy = \{...user\}; // new object, not by ref \newline ` ` \newline console.log(\{myVar, otherVar\})} \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}}{{[}...Array(3){]} // {[}0, 1, 2{]} \newline ` ` \newline let ages = {[}12, 19, 6, 4{]}; \newline ages.find(age =\textgreater{} age \textgreater{}= 18); // 19 \newline ages.findIndex(age =\textgreater{} age \textgreater{}= 18); // 1 \newline ` ` \newline // de-duplicate array (not collection) \newline dedupe = array =\textgreater{} {[}...new Set(array){]}} \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}{jsx}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{\textless{}c \{ ...\{ foo: 1 \} \} foo=\{2\} /\textgreater{} \newline ` ` \newline \textless{}с \{ ...\{ user, fudge, bits \} \} /\textgreater{}} \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}{math}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{\textasciitilde{}-1 = 0} \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}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{\{ let c = 1 \} // scoped function \newline ` ` \newline f =\textgreater{} f // noop \newline ` ` \newline const throwIfMissing = () =\textgreater{} \{ \newline     throw new Error('Missing parameter'); \newline \} \newline const func = (requiredParam = throwIfMissing()) =\textgreater{} \{\}} \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}{strings}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{\seqsplit{string.includes(substring)} \newline ` ` \newline let numString = \textbackslash{}`\$\{num\}\textbackslash{}`; // cast to string \newline ` ` \newline // string to array \newline const str = "aabbccaaaaaaaccc"; \newline const result = {[}...str{]}} \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}{classes}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{// abstract class \newline class Note \{ \newline   constructor() \{ \newline     if (new.target === Note) \{ \newline       throw new Error('Directly constructed.') \newline     \} \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}{await / async}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{function getJSON(url) \{ \newline   return new Promise(function(resolve, reject) \{ \newline     request(url, function(err, res, body) \{ \newline       resolve(body); \newline     \}); \newline   \}); \newline \} \newline // \newline async function main() \{ \newline  try\{   \newline   var data = await getJSON(); \newline   console.log(data); // NOT undefined! \newline  \} catch(e)\{\} \newline \} \newline // \newline main();} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}


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

\end{document}