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From: Bart Schaefer <schaefer@brasslantern.com>
Message-Id: <160930112615.ZM16681@torch.brasslantern.com>
Date: Fri, 30 Sep 2016 11:26:15 -0700
In-Reply-To: <20160930074509.GA2554@fujitsu.shahaf.local2>
Comments: In reply to Daniel Shahaf <d.s@daniel.shahaf.name>
        "Re: Passing array to function" (Sep 30,  7:45am)
References: <1A643BF6-28C9-483E-9312-D8C856D41F0D__26800.772539764$1475219850$gmane$org@gmail.com> 
	<20160930074509.GA2554@fujitsu.shahaf.local2>
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Subject: Re: Passing array to function
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On Sep 30,  7:45am, Daniel Shahaf wrote:
} Subject: Re: Passing array to function
}
} Ignatius Reilly wrote on Fri, Sep 30, 2016 at 02:15:55 -0500:
} > addtoarray() { [[ -d $1 ]] && myarray=($1 $myarray) }
} > 
} > addtoarray /usr/foo myarray
} 
} addtoarray() {
}   [[ -d $1 ]] && eval "${(q)2}[1,0]=${(q)1}"
} }

Solution without eval:

    addtoarray() { [[ -d $1 ]] && set -A $2 $1 ${(P)2}  }

Various quoting may be necessary if you using an emulation mode or
other nonstandard setopts, but from your original example it does
not appear so.  ${(P)2} means to treat the value of $2 as a name
and expand that named parameter.