[plt-scheme] self-referential data structures

BTW, I just wrote up a Java version of this approach, with methods
atRightEnd(), atLeftEnd(), getLeft, getRight, insertLeft,  
insertRight, moveLeft, moveRight, removeLeft, and removeRight.  It's  
all purely functional, and it all seems to work.  And, of course, it  
takes about five times as much code as it would take to do the same  
thing in Scheme :-)


Stephen Bloch
sbloch at adelphi.edu