\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{HoshiYouta}
\pdfinfo{
  /Title (pw.pdf)
  /Creator (Cheatography)
  /Author (HoshiYouta)
  /Subject (PW 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{PW Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{HoshiYouta} via \textcolor{DarkBackground}{\uline{cheatography.com/211312/cs/45753/}}}
\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}HoshiYouta \\
  \uline{cheatography.com/hoshiyouta} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Published 24th February, 2025.\\
   Updated 24th February, 2025.\\
   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*}{4}

\begin{tabularx}{3.833cm}{x{1.0299 cm} x{2.4031 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{Map}}  \tn
% Row 0
\SetRowColor{LightBackground}
Map() & A JavaScript object that stores key-value pairs, where keys can be any type of data, and values can be any data type. \tn 
% Row Count 5 (+ 5)
% Row 1
\SetRowColor{white}
set(key, value) & Adds a new key-value pair to the Map. If the key already exists, it updates the value. \tn 
% Row Count 9 (+ 4)
% Row 2
\SetRowColor{LightBackground}
get(key) & Retrieves the value associated with the key from the Map. If the key doesn't exist, returns undefined. \tn 
% Row Count 13 (+ 4)
% Row 3
\SetRowColor{white}
has(key) & Checks if a key exists in the Map. Returns true or false. \tn 
% Row Count 16 (+ 3)
% Row 4
\SetRowColor{LightBackground}
delete(key) & Removes a key-value pair from the Map. \tn 
% Row Count 18 (+ 2)
% Row 5
\SetRowColor{white}
clear() & Removes all key-value pairs from the Map. \tn 
% Row Count 20 (+ 2)
% Row 6
\SetRowColor{LightBackground}
\seqsplit{forEach(callback)} & Iterates over each key-value pair in the Map and executes a provided function. \tn 
% Row Count 23 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{x{0.92691 cm} x{2.50609 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{General}}  \tn
% Row 0
\SetRowColor{LightBackground}
\seqsplit{console.log()} & Outputs a message to the console, commonly used for debugging. \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
let, const, var & Variable declaration keywords: let (block-scoped), const (block-scoped and immutable), var (function-scoped). \tn 
% Row Count 7 (+ 4)
% Row 2
\SetRowColor{LightBackground}
Promises & Represents a value that may be available in the future. It is used for handling asynchronous operations. \tn 
% Row Count 11 (+ 4)
% Row 3
\SetRowColor{white}
\seqsplit{async/await} & Used to simplify asynchronous code. await waits for a promise to resolve, and async makes a function asynchronous. \tn 
% Row Count 15 (+ 4)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{x{1.68217 cm} x{1.75083 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{Teorico}}  \tn
% Row 0
\SetRowColor{LightBackground}
DOM (Document Object Model) & The structure that represents the HTML document as a tree of nodes, allowing dynamic manipulation. \tn 
% Row Count 5 (+ 5)
% Row 1
\SetRowColor{white}
AJAX (Asynchronous JavaScript and XML) & Technique for making asynchronous HTTP requests to fetch data without refreshing the page. \tn 
% Row Count 10 (+ 5)
% Row 2
\SetRowColor{LightBackground}
JSON (JavaScript Object Notation) & Lightweight data-interchange format that's easy for humans to read and write, and for machines to parse and generate. \tn 
% Row Count 16 (+ 6)
% Row 3
\SetRowColor{white}
RESTful APIs & Design principles for building web services that are stateless and use HTTP methods for CRUD operations (GET, POST, PUT, DELETE). \tn 
% Row Count 23 (+ 7)
% Row 4
\SetRowColor{LightBackground}
CSS Flexbox & Layout model that allows for responsive and flexible design, aligning elements in rows or columns. \tn 
% Row Count 28 (+ 5)
% Row 5
\SetRowColor{white}
CSS Grid & 2D layout system for creating grid-based layouts with rows and columns. \tn 
% Row Count 32 (+ 4)
\end{tabularx}
\par\addvspace{1.3em}

\vfill
\columnbreak
\begin{tabularx}{3.833cm}{x{1.68217 cm} x{1.75083 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{Teorico (cont)}}  \tn
% Row 6
\SetRowColor{LightBackground}
CORS (Cross-Origin Resource Sharing) & A mechanism that allows restricted resources on a web page to be requested from another domain. \tn 
% Row Count 5 (+ 5)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{x{1.3732 cm} x{2.0598 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{Express}}  \tn
% Row 0
\SetRowColor{LightBackground}
express() & The function used to create an instance of an Express application. \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
\seqsplit{app.listen(port)} & Starts the Express server and listens on a specified port. For example: app.listen(3000) to listen on port 3000. \tn 
% Row Count 8 (+ 5)
% Row 2
\SetRowColor{LightBackground}
app.get(route, callback) & Defines a route handler for GET requests. For example: app.get('/', (req, res) =\textgreater{} res.send('Hello World')) \tn 
% Row Count 13 (+ 5)
% Row 3
\SetRowColor{white}
app.post(route, callback) & Defines a route handler for POST requests. For example: app.post('/submit', (req, res) =\textgreater{} res.send('Data received')) \tn 
% Row Count 18 (+ 5)
% Row 4
\SetRowColor{LightBackground}
app.put(route, callback) & Defines a route handler for PUT requests. Typically used for updating data. \tn 
% Row Count 22 (+ 4)
% Row 5
\SetRowColor{white}
\seqsplit{app.delete(route}, callback) & Defines a route handler for DELETE requests. Usually used to remove resources. \tn 
% Row Count 26 (+ 4)
% Row 6
\SetRowColor{LightBackground}
\seqsplit{app.use(middleware)} & Adds middleware to the Express app. Middleware functions execute during the lifecycle of a request. For example: app.use(express.json()) to parse JSON in request bodies. \tn 
% Row Count 34 (+ 8)
\end{tabularx}
\par\addvspace{1.3em}

\vfill
\columnbreak
\begin{tabularx}{3.833cm}{x{1.3732 cm} x{2.0598 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{Express (cont)}}  \tn
% Row 7
\SetRowColor{LightBackground}
res.send() & Sends a response to the client. Can send various types of data such as strings, objects, or arrays. \tn 
% Row Count 5 (+ 5)
% Row 8
\SetRowColor{white}
res.json() & Sends a JSON response. Converts an object or array to JSON format. \tn 
% Row Count 8 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{x{1.7165 cm} x{1.7165 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{NodeJs}}  \tn
% Row 0
\SetRowColor{LightBackground}
require() & Imports modules, JSON, or local files into your Node.js application. \tn 
% Row Count 4 (+ 4)
% Row 1
\SetRowColor{white}
fs module & Provides an API for interacting with the file system, allowing you to read, write, and modify files. \tn 
% Row Count 9 (+ 5)
% Row 2
\SetRowColor{LightBackground}
module.exports & Defines what a module exports so that other files can use it. \tn 
% Row Count 13 (+ 4)
% Row 3
\SetRowColor{white}
fs.readFile(path, encoding, callback) & Asynchronously reads the contents of a file. The callback receives two arguments: an error (if any) and the data. \tn 
% Row Count 19 (+ 6)
% Row 4
\SetRowColor{LightBackground}
fs.writeFile(path, data, encoding, callback) & Asynchronously writes data to a file, replacing the file if it already exists. The callback handles error (if any). \tn 
% Row Count 25 (+ 6)
% Row 5
\SetRowColor{white}
fs.appendFile(path, data, encoding, callback) & Asynchronously appends data to a file. If the file does not exist, it is created. The callback handles error (if any). \tn 
% Row Count 31 (+ 6)
\end{tabularx}
\par\addvspace{1.3em}

\vfill
\columnbreak
\begin{tabularx}{3.833cm}{x{1.7165 cm} x{1.7165 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{NodeJs (cont)}}  \tn
% Row 6
\SetRowColor{LightBackground}
fs.copyFile(src, dest, callback) & Asynchronously copies a file from src to dest. The callback handles error (if any). \tn 
% Row Count 5 (+ 5)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{3.833cm}{x{1.27021 cm} x{2.16279 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{3.833cm}}{\bf\textcolor{white}{Events}}  \tn
% Row 0
\SetRowColor{LightBackground}
\seqsplit{addEventListener()} & Attaches an event handler to an element for a specific event. \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
\seqsplit{removeEventListener()} & Removes an event handler from an element. \tn 
% Row Count 5 (+ 2)
% Row 2
\SetRowColor{LightBackground}
event.target & Returns the element that triggered the event. \tn 
% Row Count 7 (+ 2)
% Row 3
\SetRowColor{white}
\seqsplit{event.preventDefault()} & Cancels the default behavior of an event (e.g., prevents form submission). \tn 
% Row Count 10 (+ 3)
% Row 4
\SetRowColor{LightBackground}
\seqsplit{event.stopPropagation()} & Stops the event from propagating up or down the DOM tree. \tn 
% Row Count 13 (+ 3)
% Row 5
\SetRowColor{white}
\seqsplit{DOMContentLoaded} & Fires when the HTML has been completely loaded, but before stylesheets, images, and subframes finish loading. \tn 
% Row Count 18 (+ 5)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}


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

\end{document}