Binary Search Tree Assignment

We will build some of the Higher Order Function Hall of Fame inductees but for a tree datatype.

datatype 'a tree = LEAF | BRANCH of 'a tree * 'a * 'a tree

Code To Implement

• binary_tree/binary_tree.sml
• binary_tree/apps_using_binary_tree.sml

BinaryTree

datatype 'a tree = LEAF | BRANCH of 'a tree * 'a * 'a tree

insert

fun insert (compare_function:(('a * 'a) -> order)) (t:'a tree) (item:'a) : 'a tree

map

reference: List.map

fun map(f : 'a -> 'b, t : 'a tree) : 'b tree = 
    raise NotYetImplemented

filter

reference: List.filter

fun filter(predicate : 'a -> bool, t : 'a tree) : 'a tree = 
    raise NotYetImplemented

find_lnr

reference: List.find

reference: In-order traversal

fun find_lnr(predicate : 'a -> bool, t : 'a tree) : 'a option =
    raise NotYetImplemented

fold_lnr

reference: List.foldl

reference: In-order traversal

fun fold_lnr(f : 'a * 'b -> 'b, init : 'b, t : 'a tree ) : 'b = 
    raise NotYetImplemented

Application

max_height

fun max_height(t : 'a BinaryTree.tree) : int = 
 	raise NotYetImplemented

sum_int_tree

fun sum_int_tree(t : int BinaryTree.tree) : int =
 	raise NotYetImplemented

Testing

studioTree/unittest_tree.sml