Use keys (or values, in case you don't need to know which keys the hasrefs are associated with): 

foreach my $lig (keys %{$ligHash})
{
    DoDump($ligHash->{$lig});
}

[download]

(not using keys/values will simply flatten the hash, so you get all its elements, i.e. alternating keys and values)

In reply to Re: Problem cycling through top level of nested hashes by almut
in thread Problem cycling through top level of nested hashes by tomdbs98

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