Storing environment arguments

Question

Consider this example:

\documentclass{article}

\newcommand{\baz}{}
\newenvironment{foo}[1]{#1}{\makeatletter\g@addto@macro\baz{#1}\makeatother}

\begin{document}

\begin{foo}{bar}
\end{foo}
\end{document}

The example does not work. What I am aiming to achieve is concatenating all parameters used with foo, so I can output them at the end of the document. What is the correct approach for that?

Answer 1

It would be easier to store the parameters at the start of the environment, rather than at the end.

\documentclass{article}
\newcommand{\baz}{}
\makeatletter
\newenvironment{foo}[1]{\g@addto@macro\baz{#1}}{}
\makeatother
\begin{document}
\begin{foo}{kidney}
\end{foo}
\begin{foo}{spleen}
\end{foo}
\begin{foo}{liver}
\end{foo}

\baz
\end{document}

If you need to do it at the end, you might find the solutions to this question useful.