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Re: Autovivification identification

by ikegami (Pope)
on Aug 02, 2013 at 04:18 UTC ( #1047537=note: print w/replies, xml ) Need Help??

in reply to Autovivification identification

that how perl has been identified that it has to go for Array or Hash Autovivification?

Autovivification is the creation of a variable by a dereference when the variable being dereferenced is undefined.

Perl knows what to create based on the kind of deference used.

  • If you have an array element dereference ($$r[$i], $r->[$i]), it'll create an array.
  • If you have an hash element dereference ($$r{$k}, $r->{$i}), it'll create a hash.
  • If you have an array dereference (@$r), it'll create an array.
  • If you have an hash dereference (%$r), it'll create a hash.
  • etc.

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