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  1. or download this
    sub morf {
    
    ...
        $tester->($testval) ? $true_word : $false_word ;
    
    }
    
  2. or download this
    sub se {
        my ($val) = @_;
    
        sub { $_[0] eq $val } ;
    }
    
  3. or download this
    morf(se('M'), $driver->{gender}, 'Male', 'Female') ;