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Truth and Falsehood in man perlsyn explains:

The number 0, the strings '0' and "", the empty list "()", and "undef" are all false in a boolean context. All other values are true.

In Perl, the following evaluate to false in conditionals:

0
'0'
undef
''  # Empty scalar
()  # Empty list
('')

The rest are true. There are no barewords for true or false.

Truth and Falsehood in man perlsyn explains:

The number 0, the strings '0' and "", the empty list "()", and "undef" are all false in a boolean context. All other values are true.

In Perl, the following evaluate to false in conditionals:

0
'0'
undef
''  # Empty scalar
()  # Empty list
('')

The rest are true. There are no barewords for true or false. (Note: Perl v5.38 introduced true and false through the new builtin pragma).

In Perl, the following evaluate to false in conditionals:

0
'0'
undef
''  # Empty scalar
()  # Empty list
('')

The rest are true. There are no barewords for true or false.

Truth and Falsehood in man perlsyn explains:

The number 0, the strings '0' and "", the empty list "()", and "undef" are all false in a boolean context. All other values are true.

In Perl, the following evaluate to false in conditionals:

0
'0'
undef
''  # Empty scalar
()  # Empty list
('')

The rest are true. There are no barewords for true or false.

In Perl, the following evaluate to false in conditionals:

0
"0"
undef
''  # Empty scalar
()  # Empty list

The rest are true. There are no barewords for true or false.

In Perl, the following evaluate to false in conditionals:

0
'0'
undef
''  # Empty scalar
()  # Empty list
('')

The rest are true. There are no barewords for true or false.