Wie funktioniert eine if-Abfrage in Latex

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\documentclass{article}
\usepackage{xstring}
\newcommand{\DEBUG}{OFF}%
\begin{document}
    \IfStrEq{\DEBUG}{ON}{
        DEBUG was on
    }{
    DEBUG was off
}
\end{document}
 
 
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    \begin{forest}
        for tree={
            folder,
            grow'=0,
            fit=band,
        },
            \IfStrEq{\DEBUG}{ON}{
                split dir tree auto,
            }{
            %Text
         }
        %split dir tree auto, ->Auskommetiert damit es funktioniert
        [ XYZ
        [ XYZ
        [ XYZ,edge label={node[pos=0.75,above,font=\scriptsize]{1}}
         [ XYZ,edge label={node[pos=0.75,above,font=\scriptsize]{1}}
        ]
        ]
        ]
        ]
    \end{forest}
 
 
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\usepackage{storebox}
\usepackage[edges]{forest}
\usepackage{adjustbox}
\usepackage{ifthen}
\newboolean{somevariable}
\setboolean{somevariable}{false}
%Zeilenumbruch in der tikz Umgebung!
% addaswyd o gôd Sašo Živanović: http://tex.stackexchange.com/a/296771/
\def\hiddenparcommand{\par}
\newcommand\otherhiddenparcommand{\par\noindent}
\newcommand\hiddencommacommand{, }
\forestset{%
    declare keylist register={split here ids},% the list of nodes to split the tree at
    split here ids={},
    declare keylist register={split here interjects},% the list of comments to put in between the tree parts
    split here interjects={},
    declare keylist={split here auto siblings}{},% a list to hold the siblings which need edge restoration
    declare toks register=split here toks,
    declare dimen register=tmpdima,
    tmpdima'=0pt,
    declare dimen register=tmpdimb,
    tmpdimb'=0pt,
    declare dimen register=tmpdimc,
    tmpdimc'=0pt,
    to widest/.style={
        tikz+={\path (\forestregister{tempdima}, \forestoption{y}) -- (\forestregister{tempdimb}, \forestoption{y});},
    },
    hide commas/.style={%
        split here toks+={\hiddencommacommand},
        split here toks+={#1},
    },
    split dir tree pre/.style={%
        label={[text=gray, anchor=north, font=\scriptsize]below:{[cont.]}{}},
    },
    split dir tree post/.style={%
        label={[font=\scriptsize, anchor=south, text=gray]above:{[cont.]}{}},
    },
    split dir tree auto post/.style={% this gets applied to the first node after a break
        split dir tree post,
        tempkeylistc'={},
 
 
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