Tabularray - Display row one by one on Beamer?

Question

Following this question regarding Tabularray and beamer compatibility, How do you get to display a the table row by row in beamer ?

MWE

\documentclass{beamer}
\usepackage{tabularray}
\UseTblrLibrary{counter} %% added this line
\begin{document}
\begin{frame}
    \frametitle{TEST}
\begin{tblr}{
        colspec={cc},
        width=\textwidth,
    }
    \visible<+(1)->{Test} & \visible<+(1)->{Test} \\
    \visible<+(1)->{Test} & \visible<+(1)->{Test} \\

%        \visible<+(1)->{Test& Test \ } % pb here
%        \visible<+(1)->{Test& Test \ }
    \end{tblr}
\end{frame}
\end{document}

Answer 1

See GitHub Issue #226 and TopAnswers #2000 for more details.

It is easy to display a tabularray table row by row, column by column, or cell by cell in a beamer document, by using counter library and cmd key:

\documentclass{beamer}
\usepackage{tabularray}
\UseTblrLibrary{counter}
\begin{document}
\begin{frame}
\frametitle{Show a taularray row by row}
\begin{tblr}{colspec={lll},cells={cmd=\onslide<\arabic{rownum}->}}
 Alpha   & Beta  & Gamma  \
 Epsilon & Zeta  & Eta    \
 Iota    & Kappa & Lambda \
\end{tblr}
\end{frame}
\begin{frame}
\frametitle{Show a tabularray column by column}
\begin{tblr}{colspec={lll},cells={cmd=\onslide<\arabic{colnum}->}}
 Alpha   & Beta  & Gamma  \
 Epsilon & Zeta  & Eta    \
 Iota    & Kappa & Lambda \
\end{tblr}
\end{frame}
\begin{frame}
\frametitle{Show a tabularray cell by cell}
\begin{tblr}{colspec={lll},cells={cmd=\onslide<+->}}
 Alpha   & Beta  & Gamma  \
 Epsilon & Zeta  & Eta    \
 Iota    & Kappa & Lambda \
\end{tblr}
\end{frame}
\end{document}

Answer 2

You can always use absolute frame number:

\documentclass{beamer}
\usepackage{tabularray}
\UseTblrLibrary{counter} %% added this line
\begin{document}
\begin{frame}
    \frametitle{TEST}

    \begin{tblr}{
            colspec={cc},
            width=\textwidth,
        }
        \visible<+(1)->{Test} & \visible<+(1)->{Test} \\
        \visible<+(1)->{Test} & \visible<+(1)->{Test} \\
        \visible<6->{Test} & \visible<6->{Test} \\ 
        \visible<7->{Test} & \visible<7->{Test} \\
    \end{tblr}

\end{frame}

\end{document}