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my $class =
    $type == 0 ? 'ClassA' :
    $type == 1 ? 'ClassB' :
    'ClassC';
my $obj = $class->new( foo => 1, bar => 2 );

my %args = ( foo => 1, bar => 2 );
my $class = 
    $type == 0 ? ClassA->new( %args ) :
    $type == 1 ? ClassB->new( %args ) :
    'ClassC';

my $class;
given $type {
...
    default { $class = ClassC }
}
my $obj = $class.new( foo => 1, bar => 1 );

my @args = ( foo => 1, bar => 1 );
my $obj;
...
    when 1 { $obj = ClassB.new( |@args ) }
    default { $obj = ClassC.new( |@args ) }
}