nl_tokens: Simple helper function that s probably faster than using Array filter methods and can be inlined .
pl_tokens: function union ( dest , added ) { var destLength = dest . <mask> ; var addedLength = added . length ; var returned = [ ] ; if ( destLength === 0 && addedLength === 0 ) return returned ; for ( var j = 0 ; j < destLength ; j ++ ) returned [ j ] = dest [ j ] ; if ( addedLength === 0 ) return returned ; for ( var i = 0 ; i < addedLength ; i ++ ) { var missing = true ; for ( j = 0 ; j < destLength ; j ++ ) { if ( dest [ j ] . uid === added [ i ] . uid ) { missing = false ; break ; } } if ( missing ) returned . push ( added [ i ] ) ; } return returned ; }