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my %control = map { $_ => 'false' } split ' ', 'play ctrl loop'
%control = map { $_ => 'true' } split ' ', $4;

  my %control = map { $_ => 'false' } qw(play ctrl loop);
  $control{$_} = 'true' for split ' ', $4;

  my %control = map { $_ => 'false' } qw(play ctrl loop);
  %control = (%control, map { $_ => 'true' } split ' ', $4);

  my %control = map { $_ => 'true' } split ' ', $4;
  $control{$_} ||= 'false' for qw(play ctrl loop);

  my %control = map { $_ => 'true' } split ' ', $4;
  %control = ((map { $_ => 'false' } qw(play ctrl loop)), %control);

  my %control = ((map { $_ => 'false' } qw(play ctrl loop)),
                 (map { $_ => 'true' } split ' ', $4));