How do I define a new function `juse`

Question

I want to define a new function juse which takes 3 parameters and prints the second one.
However, this doesn't work:
documentclass{article}
newcommandjuse{#1#2#3}{#2}
begin{document}
$juse{ abc }  {def} { ghi }$
end{document}

It should print $def$ but gives an error.

TobiBS · Accepted Answer

To define a command in LaTeX that takes three mandatory arguments you'd only have to add a [3] to it. So a complete example would be:
documentclass{article}
newcommandjuse[3]{#2}
begin{document}
$juse{ abc }  {def} { ghi }$
end{document}

It is a bit unclear however, what you want to achieve with the command in a math enviroment, or if I got you wrong with the $'s.

How do I define a new function `juse`

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