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Re: Is there an isArray() in Perl?

by Molt (Chaplain)
on May 11, 2005 at 11:37 UTC ( #455955=note: print w/replies, xml ) Need Help??

in reply to Is there an isArray() in Perl?

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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