Is there a built-in true/false boolean value in Perl? [duplicate]

Answer 1

You are using barewords true and false. Bare words are a Bad Thing. If you try this:

use strict;
use warnings;
if (true){print 1}

You'll probably get something like this:

Bareword "true" not allowed while "strict subs" in use at - line 3.
Execution of - aborted due to compilation errors.

Any defined value that doesn't look like 0 is considered "true". Any undefined value or any value that looks like 0 (such as 0 or "0") is considered "false". There's no built-in keyword for these values. You can just use 0 and 1 (or stick in use constant { true => 1, false => 0}; if it really bothers you. :)