Re: Is there a True Boolean type in Perl?

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On Oct 15, 2007, at 4:27 PM, Michael Barto wrote:

> As both Java and Javascript both have a 'true' and 'false' or  
> Boolean data type, is there any interest in evolution of Perl to  
> have a true Boolean. Or what is the preferred method to do this in  
> Perl. The "C" programmers want me to use "0"'s and "1"'s.

In my experience the most common convention is to use undef and 1 as  
your boolean values, as in:

my $is_scared;    # is_scared is initially set to undef, which  
evaluates as "false"

if ($monsters_under_my_bed) {
	$is_scared = 1;
}

Yeah, it's probably bad karma to use "undef" when you mean "0" but  
this approach is very perl-ish, easy to read, and even recommended by  
Damian Conway in his "Perl Best Practices" book (page 40... just  
checked. :-D)

---
Gary Blackburn
gblackburn@[EMAIL PROTECTED]