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  1. or download this
    "my" variable $id masks earlier declaration in same scope
  2. or download this
    if     ( my $id = $obj->get_id() )
{
...
{
    $obj->do_somethingelse();
}
  3. or download this
    my $id ;
if     ( $id = $obj->get_id() )
...
{
    $obj->do_somethingelse();
}