\documentclass[10pt,a4paper]{article}

% Packages
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\usepackage{multicol}           % Allows multicols in tables
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\usepackage{tabulary}           % Used in header and footer
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\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{BeckyIndirectlyToo}
\pdfinfo{
  /Title (kotlin-basics.pdf)
  /Creator (Cheatography)
  /Author (BeckyIndirectlyToo)
  /Subject (Kotlin Basics Cheat Sheet)
}

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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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% 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{Kotlin Basics Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{BeckyIndirectlyToo} via \textcolor{DarkBackground}{\uline{cheatography.com/192748/cs/40091/}}}
\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}BeckyIndirectlyToo \\
  \uline{cheatography.com/beckyindirectlytoo} \\
  \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 31st August, 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{6.8 cm} x{1.2 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Comments}}  \tn
% Row 0
\SetRowColor{LightBackground}
//single-line & \seqsplit{comment} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
/* multiline */ & \seqsplit{comment} \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
/* blah \{\{nl\}\} /* nested */ \{\{nl\}\} blah */ & \seqsplit{comment} \tn 
% Row Count 6 (+ 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}{If - Else If - Else Example}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{val count = 42 \newline if (count == 42) \{ \newline ~ println ("I have the answer") \newline \} else if (count \textgreater{} 35 \&\& count \textless{} 49) \{ \newline ~ printlin ("The answer is close") \newline \} else \{ \newline ~ println ("The answer eludes me.") \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}{When Example}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{cal answerString = when \{ \newline ~ count == 42 -\textgreater{} "I have the answer" \newline ~ count \textgreater{} 35 -\textgreater{} "The answer is close." \newline ~ else -\textgreater{} "The answer eludes me." \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}{Array Examples}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{// {\bf{once an array is created the size is fixed}} \newline val school = arrayOf("shark", "salmon", "minnow", 2) \newline println(java.util.Arrays.toString(school)) \newline  \newline //{\bf{mixed type array}} \newline val numbers = intArrayOf(1,2,3) \newline  \newline //{\bf{print array}} \newline for (element in school)\{ \newline ~ print(element + " ") \newline \} \newline  \newline // {\bf{concatenate arrays}} \newline array3 = array1 + array2 \newline  \newline // {\bf{initialize array with code}} \newline val array = Array (5) \{ it * 2\}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{elements cannot be added or removed, except by copying to a new array \newline {\bf{can loop through elements and index at the same time}}}  \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}{Lists}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{// {\bf{create list, cannot be changed}} \newline val school = listOf("mackerel", "trout") \newline  \newline // {\bf{create list, can be changed}} \newline val myList = mutableListOf("tuna'", "salmon") \{\{nl\}\}myList.remove("shark")\{\{nl\}\}} \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 Example}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{// {\bf{create function}} \newline var count:Int = 42 \newline fun generateAnswerString(): String \{ \newline ~ val answerString = if (count ==42) \{ \newline ~ ~ "I have the answer." \newline ~ \} else \{ \newline ~ ~ "The anwer eludes me" \newline ~ \} \newline ~ return answerString \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Anonymous Function Example}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{//{\bf{Anonymous functions}} \newline val stringLengthFunc: (String) -\textgreater{} Int = \{input -\textgreater{} \newline ~ input.length \newline \} \newline  \newline // {\bf{call anonymous function}} \newline val stringLength: Int = \seqsplit{stringLengthFunc("Android")}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Class Examples}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{//{\bf{create class}} \newline class Car\{ \newline ~ //properties \newline ~ val wheels = listOf\textless{}Wheel\textgreater{}() \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{1.52 cm} x{2.584 cm} x{3.496 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{3}{x{8.4cm}}{\bf\textcolor{white}{Data Types}}  \tn
% Row 0
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{\bf{Type}} & {\bf{Size(bits)}} & {\bf{Values}} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
Byte & 8 & -128 to 127 \tn 
% Row Count 3 (+ 1)
% Row 2
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Short & 16 & -32768 to 32767 \tn 
% Row Count 4 (+ 1)
% Row 3
\SetRowColor{white}
Int & 32 & -2\textasciicircum{}31\textasciicircum{} to 2\textasciicircum{}31\textasciicircum{} -1 \tn 
% Row Count 5 (+ 1)
% Row 4
\SetRowColor{LightBackground}
Long & 64 & -2\textasciicircum{}63\textasciicircum{} to 2\textasciicircum{}63\textasciicircum{} - 1 \tn 
% Row Count 7 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}---}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{3.2 cm} x{4.8 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Variable Declaration}}  \tn
% Row 0
\SetRowColor{LightBackground}
val count : Int = 10 & value can never change \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
var count : Double = 10.01 & value can change \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
val eFloat : Float = 3.14f & needs the f suffex \tn 
% Row Count 6 (+ 2)
% Row 3
\SetRowColor{white}
val name: String? = null & add ? to make a nullable value \tn 
% Row Count 8 (+ 2)
% Row 4
\SetRowColor{LightBackground}
val name : String? = name!! & not-null assertion operator \{\{nl\}\} throws exception if full \tn 
% Row Count 11 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{8.4cm}}{variable interpolation: \$count \newline {\bf{Kotlin variables can't hold null values by default.}}}  \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}{For Loop Examples}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{// {\bf{print index and element}} \newline for ((index, element) in school.withIndex())\{ \newline ~ println("Item at \$index is \$element\textbackslash{}n") \newline \} \newline  \newline //{\bf{print range of numbers or letters}} \newline for (i in 'a'..'h') print (i) \newline for (i in 5 downTo 1 step 1.5) print(i)} \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}{While Examples}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{var bubbles = 0 \newline while (bubbles \textless{} 50) \{ \newline ~ bubbles++ \newline \} \newline println("\$bubbles bubbles in the water/n") \newline  \newline do \{ \newline ~ bubbles-{}- \newline \} while (bubbles \textgreater{} 50) \newline println("\$bubbles bubbles in the water/n") \newline  \newline repeat(2) \{ \newline ~ println("A fish is swimming.") \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{p{0.8 cm} p{0.8 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Function with Argument Example}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{8.4cm}}{} \tn 
% Row Count 0 (+ 0)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{8.4cm}}{// {\bf{call function}} \newline val answerString = generateAnswerString() \newline  \newline // {\bf{function with argument}} \newline fun generateAnswerString (countThreshold: Int) :String \{ \newline ~ ... \newline ~ \} \newline ~ return answerString \newline \} \newline  \newline // {\bf{call function with argument}} \newline  \newline val answerString = generateAnswerString(42)}  \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}{Void Function Example}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{// {\bf{void function}} \newline fun printSum(a: Int, b: Int): Unit \{ \newline ~ println("sum of \$a and \$b is \$\{a + b\}") \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}{Higher-Order Functions}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{// {\bf{functions that can take functions as arguments}} \newline fun stringMapper(str:String, mapper: (String) -\textgreater{} Int): Int \{ \newline ~ //Invoke function \newline ~ return mapper(str) \newline \} \newline  \newline //**anonymous function can be called outside the parenthesis \newline stringMapper("Android") \{ input -\textgreater{} \newline ~ input.length \newline \}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}


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

\end{document}