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    use List::Util qw( first ) ;

...
    }

$jim = lowercase( 'Jim' ) ;
  2. or download this
      Three conditions:

  @me = lowercase( qw( TQIS Jim ) ) ;  ## returns qw( tqis jim )
  $me = lowercase( 'Jim' ) ;           ## returns 'jim'
  @me = lowercase( qw( Jim ) ) ;       ## returns qw( jim )