From: Bart Schaefer <schaefer@brasslantern.com>
To: "Jun T." <takimoto-j@kba.biglobe.ne.jp>
Cc: "zsh-workers@zsh.org" <zsh-workers@zsh.org>
Subject: Re: [PATCH] Optimization of getarrvalue()
Date: Wed, 23 Nov 2016 16:55:13 -0800 [thread overview]
Message-ID: <CAH+w=7YN-pzoGn5AC260sS3yLMKRL0kjaSY1zMihRKs5wEiM1Q@mail.gmail.com> (raw)
In-Reply-To: <F678A4CE-CDBD-4BCE-BB43-DB55FFA82073@kba.biglobe.ne.jp>
On Mon, Nov 21, 2016 at 4:30 AM, Jun T. <takimoto-j@kba.biglobe.ne.jp> wrote:
>
> Maybe, but I still don't understand, for example, the following:
>
> % a=()
> % nargs "${(@)a[0]}"
> 1
> % a=( foo )
> % nargs "${(@)a[0]}"
> 0
OK, I agree that one is strange. However:
> % a=( foo bar )
> % nargs "${(@)a[3]}"
> 1
> % nargs "${(@)a[3,3]}" # or "${(@)a[3,4]}" "${(@)a[3,5]}" ...
> 0
Two subscripts separated by a comma mean something different than one
subscript. a[3] is a scalar, so adding (@) doesn't matter; a scalar
in double quotes is the empty string. a[3,3] is an array, and an
array with the (@) flag in double quotes resolves to nothing if the
array is empty. The only magic here is the already-magic semantics of
double-quoting "${a[@]}".
> More generally, $a[i,j] with i=$#a+1 is treated specially.
?? It's not treated any differently than i=$#a+N for any N >=0, is it?
next prev parent reply other threads:[~2016-11-24 1:02 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20161108201233epcas1p1e2900e2d67af8b8558ebdb70eb7ad480@epcas1p1.samsung.com>
2016-11-08 20:11 ` Sebastian Gniazdowski
2016-11-08 21:58 ` Bart Schaefer
2016-11-09 7:11 ` Bart Schaefer
2016-11-09 11:42 ` Peter Stephenson
2016-11-09 16:03 ` Bart Schaefer
2016-11-14 12:32 ` Jun T.
2016-11-14 13:15 ` Jun T.
2016-11-14 13:57 ` Peter Stephenson
2016-11-14 15:35 ` Jun T.
2016-11-14 17:10 ` Bart Schaefer
2016-11-16 7:55 ` Sebastian Gniazdowski
2016-11-15 12:28 ` Peter Stephenson
2016-11-15 19:57 ` Peter Stephenson
2016-11-15 21:11 ` Bart Schaefer
2016-11-16 14:06 ` Jun T.
2016-11-16 16:14 ` Jun T.
2016-11-16 18:50 ` Bart Schaefer
2016-11-21 12:30 ` Jun T.
2016-11-24 0:55 ` Bart Schaefer [this message]
2016-11-24 11:49 ` Jun T.
2016-11-29 6:11 ` Array slices that don't exist [was Optimization of getarrvalue()] Bart Schaefer
2016-11-29 9:34 ` Peter Stephenson
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