nl_tokens: Returns elements of first array if they are not present in second . And false - otherwise .
pl_tokens: function arrayDiff ( needles , array ) { var diff = [ ] ; if ( typeOf ( needles ) !== 'array' ) { needles = [ needles ] ; } if ( typeOf ( array ) !== 'array' ) { array = [ array ] ; } for ( var i in needles ) { if ( inArray ( needles [ i ] , <mask> ) === - 1 ) { diff . push ( needles [ i ] ) ; } } return diff . length ? diff : false ; }