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Re: Difference in Hash Declaration

by MidLifeXis (Monsignor)
on May 07, 2012 at 13:47 UTC ( #969262=note: print w/ replies, xml ) Need Help??

in reply to Difference in Hash Declaration

The only one that is syntactically valid is the second one, however, I don't believe that it is doing what you are expecting. Since the parens denote precedence, what Perl reads it as is:

my %sham = ( 1 => "j", 2 => "b", 1 => "p", 2 => "b", );

When assigning to hashes, later insertions with the same key end up replacing any earlier entries with the same key, leaving you with:

my %sham = ( 1 => "p", 2 => "b", );

This can be shown with the use of Data::Dumper or the like. I think what you are intending is:

my @sham = ( # note the sigil { 1 => "j", 2 => "b", }, { 1 => "p", 2 => "b", }, );

Data::Dumper (and any similar module) is a useful tool for visualizing nested data structures.


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