From: Daniel Shahaf <d.s@daniel.shahaf.name>
To: Zsh Users <zsh-users@zsh.org>
Cc: zzapper <zsh@rayninfo.co.uk>
Subject: Re: alias with a parameter
Date: Thu, 15 Apr 2021 20:30:46 +0000 [thread overview]
Message-ID: <20210415203046.GB6669@tarpaulin.shahaf.local2> (raw)
In-Reply-To: <CAH+w=7YzFFNXYpSaWL9hBsZ4km7GvhW8mWT8HQTGkDjfcsO5bA@mail.gmail.com>
Bart Schaefer wrote on Thu, Apr 15, 2021 at 11:19:16 -0700:
> On Wed, Apr 14, 2021 at 4:10 AM zzapper <zsh@rayninfo.co.uk> wrote:
> > if [ $# -gt 0 ] ; then
>
> It's generally preferable to use [[ ... ]] instead of [ ... ] because
> "[" is just another name for "test" and "]" is just one of its
> arguments, whereas "[[" and "]]" are syntax tokens with parsing rules
> for what appears between them. However, since you're comparing
> numbers, you could use (( $# > 0 )) here.
In general, «(( ${+foo[1]} ))» is faster than «(( ${#foo} ))», because
the latter takes O(N) time where N is the length of the array, where's
the former is O(1). For the positional arguments, that'd be «(( $+1 ))».
next prev parent reply other threads:[~2021-04-15 20:32 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-05 22:55 dukeofpurl
2021-04-06 0:16 ` lb
2021-04-06 3:40 ` Duke Normandin
2021-04-06 14:42 ` Greg Klanderman
2021-04-06 2:47 ` Grant Taylor
2021-04-07 7:05 ` Stephane Chazelas
2021-04-07 12:48 ` lb
2021-04-07 12:58 ` Peter Stephenson
2021-04-08 1:06 ` Grant Taylor
2021-04-08 1:25 ` Daniel Shahaf
2021-04-09 2:55 ` Grant Taylor
2021-04-09 22:49 ` Daniel Shahaf
2021-04-10 7:32 ` david rayner
2021-04-10 10:38 ` Marc Chantreux
2021-04-14 11:10 ` zzapper
2021-04-15 18:19 ` Bart Schaefer
2021-04-15 19:56 ` (prefix case terminators?) " Marc Chantreux
2021-04-15 23:52 ` Bart Schaefer
2021-04-16 6:46 ` Marc Chantreux
2021-04-15 20:30 ` Daniel Shahaf [this message]
2021-04-16 7:34 ` zapper
2021-04-16 10:12 ` Stephane Chazelas
2021-04-10 16:30 ` Grant Taylor
2021-04-10 16:34 ` Grant Taylor
2021-04-13 11:22 ` Daniel Shahaf
2021-04-07 14:43 ` Daniel Shahaf
2021-04-07 14:54 Duke Normandin
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