Why is there a number in this zsh parameter expansion – unix.stackexchange.com

Why is there a number in this zsh parameter expansion – unix.stackexchange.com

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I have this script I'm basing my current script off of. I just don't understand why he has typeset result part dir=${1-$PWD} in there. I get the same result if I just write dir=$PWD. With typeset is ...

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