Re: How does this code work? (from "Perl is Unix")

regarding

sub strip {
    s/\A\s+//, s/\s+\z// for my @r = @_;
    @r
}
[download]

The for is acting on @_ which in perl is 'the array i'm currently looking at' and in this scope is the list you passed to strip. ugly code though.

for the other use Proc::Fork; is probably of interest

see http://search.cpan.org/~aristotle/Proc-Fork-0.71/lib/Proc/Fork.pm
run_fork -creates a fork for the block
child - declares the block to run with a child

Comment on Re: How does this code work? (from "Perl is Unix") Download Code

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Re^2: How does this code work? (from "Perl is Unix") by Anonymous Monk on Nov 06, 2009 at 06:21 UTC
I'm not concerned with forking code here, per se. What I'd just like to know is, what does something like `foo { bar { ... } baz { ... } }` [download] even mean? I know what $, @, %, and & signify, and I know what `sub {...}` gets me, but it's just completely flying over my head what I'm looking at here with these barewords followed by code in curlies. Am I missing something obvious? :)	[reply] [d/l]
Re^3: How does this code work? (from "Perl is Unix") by rowdog (Curate) on Nov 06, 2009 at 08:10 UTC
As colwellj pointed out, that bit of code is documented in Proc::Fork	[reply]
Re^2: How does this code work? (from "Perl is Unix") by Aristotle (Chancellor) on Nov 07, 2009 at 03:18 UTC
I didn’t aim for clarity in that bit. I wanted to waste the least space possible on code to perform this function, because I was contrasting with Ruby and Python examples, where there is no need to write any code for this because both languages include `strip` methods in their built in String classes. Maybe I should lobby for the inclusion of a `strip` function in Scalar::Util. (It could even be written in XS, and therefore go faster than regexes. Hmm. There’s a thought.) Makeshifts last the longest.	[reply] [d/l] [select]
Re^3: How does this code work? (from "Perl is Unix") by Anonymous Monk on Nov 07, 2009 at 09:03 UTC
Is it just me or does the whole bunch of Utils modules seem very haphazard, from namespace choices to grouping	[reply]