Hi nandymamith,
- $a = ''; $b = {};
You really don't want to use $a and $b which are aliases for the two operands being compared in a sortsub.
- That been said, $a and $b in above are two different things in perl. While $a is an empty scalar variable, $b is a reference to an anonymous hash, created using curly brackets which is empty in this case
However, in this case, you can compare these, printing what you want like so:
use warnings;
use strict;
my $empty_str = q{};
my $empty_hash_ref = { q{} => q{}, };
for ( keys %$empty_hash_ref ) {
$empty_str eq $_ ? print "PASS" : print "FAIL"; ## print PASS
}
## use smartmarch ~~
$empty_str ~~ $empty_hash_ref ? print "PASS" : print "FAIL"; ## print
+PASS
Note however, that iterating through the hash comparing either the keys or values of the hash with the empty scalar variable, when the hash is empty ( with no variable atall) will print nothing, but using the smart match ~~ Operator will print "FAIL".
my $empty_str = q{};
my $empty_hash_ref = {}; ## why?
for (keys %$empty_hash_ref){
$empty_str eq $_? print "PASS": print "FAIL"; # print nothing
}
$empty_str~~$empty_hash_ref?print "PASS": print "FAIL"; # print FAI
+L
Hope this helps
If you tell me, I'll forget.
If you show me, I'll remember.
if you involve me, I'll understand.
--- Author unknown to me
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