You have several problems here.

You are looping through @array, but only using element 0. Perhaps you meant foreach $nbr (0..$#array) as the loop or fubar(\$_) as the body?

$array[0] and $array[1] are already hashrefs; when you have the \$array[$nbr] you end up passing a reference to a reference to a hash: probably not what you want. If you want a reference to a hash, just pass $array[$nbr]. If you want a copy of the keys and values of the hash (which is how your fubar is written), pass %{$array[$nbr]}.

In fubar, you assign to a hash from @_, but @_ won't have the needed list of keys and values. You have a prototype which will mess you up, even if you were passing a flattened hash to fubar like fubar(%hash) or fubar(%{some hash reference}). I have to echo theorbtwo's recommendation: don't use prototypes unless you know what they do. Learn them later, if you want, after many other things.

In summary, be consistent with one of these approaches:

Flattened hash (has to copy all the keys and values twice, but may sometimes be more convenient): 

sub fubar {
   my %hash = @_;
   print $hash{key1}, $hash{key2};
}
...
fubar(%{$arrayofhashes[$index]});

[download]
Reference to hash: 
sub fubar {
   my $hashref = shift;
   print $hashref->{key1}, $hashref->{key2};
}
...
fubar($arrayofhashes[$index]);

[download]
For completeness, the prototype works this way (but don't use it!): 
sub fubar(%) {
   my $hashref = shift;
   print $hashref->{key1}, $hashref->{key2};
}
...
fubar(%{$arrayofhashes[$index]});

[download]

In reply to Re: Passing Hash to Subroutine by ysth
in thread Passing Hash to Subroutine by mjmaresca

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