From: Bart Schaefer <schaefer@brasslantern.com>
To: Daniel Shahaf <d.s@daniel.shahaf.name>, zsh-users@zsh.org
Subject: Re: ${(k)widgets} v. 'zle -la'
Date: Thu, 7 Jul 2016 09:49:21 -0700 [thread overview]
Message-ID: <160707094921.ZM23499@torch.brasslantern.com> (raw)
In-Reply-To: <20160707020023.GA3859@tarsus.local2>
On Jul 7, 2:00am, Daniel Shahaf wrote:
}
} Is the following behaviour also intentional? Testing a key's presence
} in the associative array in different ways gives different results:
}
} % bindkey foo bar
} % () { print $(( $argv[(I)bar] > 0 )) } ${(k)widgets}
} 1
} % print ${+widgets[bar]}
} 0
It's intentional in that hash table entries are parameter values and
parameters can exist but be unset, like declaring something local and
then unsetting it; $widgets[bar] returns a "value" that is equivalent
to "unset" when the widget doesn't exist.
It's not intentional in that for normal hash tables there's no way to
create such an entry, so the ramifications on e.g. ${+...} of having
a special hash where a key that is present is only a placeholder, were
not fully thought through.
On the other hand it's the only result that accurately represents the
situation.
--
Barton E. Schaefer
next prev parent reply other threads:[~2016-07-07 16:49 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-05 4:57 Daniel Shahaf
2016-07-05 21:01 ` Bart Schaefer
[not found] ` <160705140120.ZM17175__36700.8317648017$1467752558$gmane$org@torch.brasslantern.com>
2016-07-07 2:00 ` Daniel Shahaf
2016-07-07 16:49 ` Bart Schaefer [this message]
[not found] ` <160707094921.ZM23499__38105.0642965876$1467910230$gmane$org@torch.brasslantern.com>
2016-07-13 4:59 ` Daniel Shahaf
2016-07-13 8:23 ` Peter Stephenson
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