If there's a chance of wanting to catch bless'ed arrays, or dealing with psychologically nasty code, such as my $item=bless {}, 'ARRAY', then it's best to be paranoid and check if you can actually treat the item as an array.
The following code snippet shows a function that does this kind of check:
for my $item (@array) {
print "We've got an array" if is_array($item);
}
sub is_array {
my ($ref) = @_;
# Firstly arrays need to be references, throw
# out non-references early.
return 0 unless ref $ref;
# Now try and eval a bit of code to treat the
# reference as an array. If it complains
# in the 'Not an ARRAY reference' then we're
# sure it's not an array, otherwise it was.
eval {
my $a = @$ref;
};
if ($@=~/^Not an ARRAY reference/) {
return 0;
} elsif ($@) {
die "Unexpected error in eval: $@\n";
} else {
return 1;
}
}
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