How do I use boolean variables in Perl?
boolean, perl
Solution
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).
Problem
I have tried: ``` $var = false; $var = FALSE; $var = False; ``` None of these work. I get the error message ``` Bareword "false" not allowed while "strict subs" is in use. ```