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Date: Tue, 15 Sep 2015 21:43:42 +0000
From: Daniel Shahaf <d.s@daniel.shahaf.name>
To: Jesper =?iso-8859-1?Q?Nyg=E5rds?= <jesper.nygards@gmail.com>
Cc: Zsh Users <zsh-users@zsh.org>
Subject: Re: Number of non-empty elements
Message-ID: <20150915214342.GD5696@tarsus.local2>
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User-Agent: Mutt/1.5.21 (2010-09-15)

Jesper Nygårds wrote on Tue, Sep 15, 2015 at 19:15:01 +0200:
> I have a fairly long function where the result is stored in an array called
> "mylines".
> 
> I want the function to return normally (status zero) if "mylines" contains
> at least one non-empty element, and with non-zero otherwise.

    return $(( $mylines[(I)?*] > 0 )0

The (I) modifier interprets the key as a pattern and returns the highest
index of a match, or 0 if there was no match.