[Tex/LaTex] Make ar­ray data struc­tures in LaTeX

Question

Is there a way to make an array in LaTeX.
I want to write a function that does this (here the array has only 2 elements but I want to be able to have many as I want).

\foo{\MakeArray{foo,bar}}

foo|bar-foo&bar

I could have done this like that

\newcommand\foo[2]{\1-\2}
\foo{foo|bar}{foo&bar}

But I need to enter the elements twice which is not very neat…

EDIT:
Sadly, even if your answer solve my question, it doesn't work with my exact case so I'll tell it exactly.
I currently have

\newcommand{\authors}[2][e ]{
  \usepackage[pdfauthor={#1}]{hyperref}
  \author{#2}
}

that I use that way

\authors{John Doe, Dark Vador and Yoda}{John Doe \and Dark Vador \and Yoda}

and I would like to have the same result without specifying it twice.
However, the \and doesn't work with the proposed solution.

Answer 1

Load the hyperref package first, and then set the PDF document properties using \hypersetup:

\documentclass{article}
\usepackage{hyperref}% http://ctan.org/pkg/hyperref
\newcommand{\authors}[1]{
  {\renewcommand{\and}{\unskip, }\hypersetup{pdfauthor={#1}}}
  \author{#1}
}
\title{My title}
\authors{John Doe \and Dark Vador \and Yoda}
\begin{document}
\maketitle
\end{document}

Inside \authors, the definition of \and is momentarily updated to insert commas.