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Re: Subroutine chaining idiom requested

by premchai21 (Curate)
on May 24, 2001 at 06:49 UTC ( [id://82799]=note: print w/replies, xml ) Need Help??

in reply to Subroutine chaining idiom requested

Hmmm... I've never read that, but to just construct one on my own:
$agenda = [ sub { "Hello" }, sub { scalar reverse shift }, sub { chop +shift } ]; chain($agenda, [ ]); ### BEGIN GOLF MODE ### sub chain($$) { my@x=@{+pop};foreach(@{+shift}){@x=$_->(@x)}@x } ### END GOLF MODE ###

Update: Fixed argument-modification error, thanks to tilly for pointing that out.

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Re (tilly) 2: Subroutine chaining idiom requested
by tilly (Archbishop) on May 24, 2001 at 07:24 UTC
    Did someone say golf?
    sub chain{(*f,*_)=@_;@_=&$_ for@f;@_}
    Of course you probably want strict compliant and it is bad style to modify your arguments in place. In which case it is probably better to make that:
    sub chain{my($f,$a)=@_;$a=[&$_(@$a)]for@$f;@$a}
    which is still reasonable...

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