nl_tokens: This method is like _ . uniq except that it accepts iteratee which is invoked for each element in array to generate the criterion by which uniqueness is computed . The order of result values is determined by the order they occur in the array . The iteratee is invoked with one argument : ( value ) .
pl_tokens: function uniqBy ( array , iteratee ) { return ( array && array . <mask> ) ? baseUniq ( array , baseIteratee ( iteratee , 2 ) ) : [ ] ; }