Re^3: Learning Programming, desperately need to know what information is contained in scalar variables

[Lotus1]

It returns true or false. There are more details at https://perldoc.perl.org/perlop.html#Equality-Operators.

[Anonymous Monk]

So it's returning true because both $alice and $bob are undef?

[AnomalousMonk]

Evaluating two undef values for string equality yields a true result. undef is temporarily promoted to "" (the empty string) in string context. If warnings are enabled, warnings are emitted.

c:\@Work\Perl\monks>perl -le
"use strict;
 use warnings;
 ;;
 use Data::Dump qw(dd);
 ;;
 my ($value, $alice, $bob);
 ;;
 $value = $alice eq $bob;
 dd 'result of comparison of undefined values', $value;
"
Use of uninitialized value in string eq at -e line 1.
Use of uninitialized value in string eq at -e line 1.
("result of comparison of undefined values", 1)

[Lotus1]

My response is 'undef'