push ( ) insert node in linked list . 15.18 .5 . 8.11 . 12
head = push ( head , 12 ) ; head = push ( head , 11 ) ; head = push ( head , 8 ) ; head = push ( head , 5 ) ; head = push ( head , 18 ) ; head = push ( head , 15 ) ; printList ( head ) ; document . write ( " " ) ; document . write ( " " ) ;