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From: Bart Schaefer <schaefer@brasslantern.com>
Message-Id: <160214110140.ZM20676@torch.brasslantern.com>
Date: Sun, 14 Feb 2016 11:01:40 -0800
In-Reply-To: <CAKc7PVDJPVa+AdJfesOUJ1pE5bcjaD2yD1w8kPDiSQ4-VVKaMA@mail.gmail.com>
Comments: In reply to Sebastian Gniazdowski <sgniazdowski@gmail.com>
        "eval "echo \"$a=( \${(qq)$a[@]} )\""" (Feb 14,  6:16pm)
References: <CAKc7PVDJPVa+AdJfesOUJ1pE5bcjaD2yD1w8kPDiSQ4-VVKaMA@mail.gmail.com>
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To: Zsh Users <zsh-users@zsh.org>
Subject: Re: eval "echo \"$a=( \${(qq)$a[@]} )\""
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On Feb 14,  6:16pm, Sebastian Gniazdowski wrote:
} Subject: eval "echo \"$a=( \${(qq)$a[@]} )\""
}
} say "a" holds array name "arr".

This is the reason ${(P)a} exists.

It wasn't fully functional for associative arrays until quite recently.

} Doing:
} 
} % a=arr; arr=( a b "c d" ); eval "echo \"$a=( \${(qq)$a[@]} )\""

The [@] is being applied to $a, not to the expansion into "arr".
You meant (note one extra set of braces):

% a=arr; arr=( a b "c d" ); eval "echo \"$a=( \${(qq)${a}[@]} )\""
arr=( 'a' 'b' 'c d' )


But all you really need is

% echo $a=\(${(kvqqP)a}\)
arr=('a' 'b' 'c d')

For an associative array that works only in zsh-5.2 and later, but it
otherwise works for both associative and indexed arrays (the kv is just
ignored in the indexed case).