\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
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\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{adrienebitner}
\pdfinfo{
  /Title (javascript-for-cambridge-a-level-cheat-sheet.pdf)
  /Creator (Cheatography)
  /Author (adrienebitner)
  /Subject (Javascript for Cambridge A Level Cheat Sheet)
}

% Lengths and widths
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% This two commands together give roughly
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% Commands
\newcommand{\SetRowColor}[1]{\noalign{\gdef\RowColorName{#1}}\rowcolor{\RowColorName}} % Shortcut for row colour
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% Font and Colours
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% 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 for Cambridge A Level Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{adrienebitner} via \textcolor{DarkBackground}{\uline{cheatography.com/183946/cs/38318/}}}
\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}adrienebitner \\
  \uline{cheatography.com/adrienebitner} \\
  \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 21st 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{tabularx}{17.67cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{17.67cm}}{\bf\textcolor{white}{Script}}  \tn
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\mymulticolumn{1}{x{17.67cm}}{\bf\textcolor{white}{Basic}}  \tn
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\mymulticolumn{1}{x{17.67cm}}{\{\{lang-javascript\}\}// One line comment \newline  \newline /{\emph{ \newline Mult-line comment \newline }}/ \newline  \newline function addNumbers(a, b)\{ \newline   return a+b; \newline \}} \tn 
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% Row 0
\SetRowColor{LightBackground}
`\{\{lang-javascript\}\}var a;` & create new variable \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
`\{\{lang-javascript\}\}var a = 10;` & create a new variable and assign value \tn 
% Row Count 4 (+ 2)
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`\{\{lang-javascript\}\}var b = "something";` & create a new variable and assign string \tn 
% Row Count 7 (+ 3)
% Row 3
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`\{\{lang-javascript\}\}c {[}0{]}` & access item 0 (first item) in array c \tn 
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% Row Count 2 (+ 2)
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% Row Count 6 (+ 2)
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% Row Count 11 (+ 5)
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% Row Count 8 (+ 2)
% Row 4
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% Row 5
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% Row Count 12 (+ 2)
% Row 6
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`\{\{lang-javascript\}\}!` & logical NOT, e.g. a != b same as !(a==b) \tn 
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\mymulticolumn{1}{x{17.67cm}}{\{\{lang-javascript\}\} \newline /{\emph{  \newline To execute the function only once, use the setTimeout() method instead. \newline To clear an interval, use the id returned from setInterval():  \newline }}/ \newline  \newline myInterval = setInterval(function, milliseconds); \newline  \newline //Then you can to stop the execution by calling clearInterval(): \newline clearInterval(myInterval); \newline  \newline // for e.g. try this \newline function printHello () \{ \newline  element.innerHTML += "Hello"; \newline \} \newline  \newline setInterval(printHello, 1000); \newline  \newline // set timeout is doing once, where it pauses, here is an example \newline setTimeout(function() \{ \newline  prompt("Do you want to continue?") \newline \}, 2000);} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\mymulticolumn{1}{x{17.67cm}}{\{\{lang-javascript\}\} //allows you to perform actions on a string and extract information \newline  \newline //for e.g. return from (startposition, endposition) \newline var word = "Hello World"; \newline console.log(word.substring(7, 11)); \newline //output: "World" \newline  \newline //for e.g. return from (startposition, noofchar) \newline var word = "Hello World"; \newline console.log(word.substr(2,4)); \newline //output: "ello" \newline  \newline //for e.g. finds the first string and replaces it with the second string \newline var word = "Hello World"; \newline var newW = word.replace("World","friends"); \newline console.log(newW); \newline //output: "Hello friends" \newline  \newline //for e.g. returns length \newline var word = "Hello".length \newline console.log(word); \newline //output: 5 \newline  \newline //for e.g. concatenate string 1 and string 2 \newline var word 1 = "Hello"; \newline var  word 2 = "World"; \newline console.log(concat(word1, " ", word2); \newline //output: Hello World \newline // this is same with if you plus the strings together \newline  \newline //toUppercase is to change to uppercase \newline var word = "hello"; \newline console.log(word.toUpperCase()); \newline  \newline //toLowerCase is to change to uppercase \newline var word = "hello"; \newline console.log(word.toLowerCase()); \newline  \newline //charAt is to return the character string at location number \newline var word = "hi" \newline console.log(word.charAt(1)); \newline //output: i} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}



\end{document}