draegtun

  # first Ruby example in article
  users.select { |u| u.admin? }.map(&:email)

  # using Perl's block list
  map {$_->email} grep {$_->is_admin} @users;

    $hash1->{key1}{key2}

    $hash1{key1}{key2}

    keys %{$hash1{key1}}

    hash1["hash_name"]["array_name"][3]

    $hash1{hash_name}{array_name}[3]