September Morn Update

Task/Set/Ol/set.ol

@@ -0,0 +1,31 @@
+; test set
+(define set1 '(1 2 3 4 5 6 7 8 9))
+(define set2 '(3 4 5 11 12 13 14))
+(define set3 '(4 5 6 7))
+(define set4 '(1 2 3 4 5 6 7 8 9))
+
+; union
+(print (union set1 set2))
+; ==> (1 2 6 7 8 9 3 4 5 11 12 13 14)
+
+; intersection
+(print (intersect set1 set2))
+; ==> (3 4 5)
+
+; difference
+(print (diff set1 set2))
+; ==> (1 2 6 7 8 9)
+
+; subset (no predefined function)
+(define (subset? a b)
+   (all (lambda (i) (has? b i)) a))
+(print (subset? set3 set1))
+; ==> #true
+(print (subset? set3 set2))
+; ==> #false
+
+; equality
+(print (equal? set1 set2))
+; ==> #false
+(print (equal? set1 set4))
+; ==> #true