Initial data commit

Task/Set/PicoLisp/set-2.l

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+# Create three test-sets
+(balance 'Set1 (1 2 3 7 abc "def" (u v w)))
+(balance 'Set2 (2 3 5 hello (x y z)))
+(balance 'Set3 (3 hello (x y z)))
+
+
+# Get contents
+: (idx 'Set1)
+-> (1 2 3 7 abc "def" (u v w))
+
+: (idx 'Set2)
+-> (2 3 5 hello (x y z))
+
+
+# Element tests (any non-NIL value means "yes")
+: (idx 'Set1 "def")
+-> ("def" (abc) (u v w))
+
+: (idx 'Set2 "def")
+-> NIL
+
+: (idx 'Set2 '(x y z))
+-> ((x y z))
+
+
+# Union
+: (use S
+   (balance 'S (idx 'Set1))
+   (balance 'S (idx 'Set2) T)
+   (idx 'S) )
+-> (1 2 3 5 7 abc "def" hello (u v w) (x y z))
+
+
+# Intersection
+: (sect (idx 'Set1) (idx 'Set2))
+-> (2 3)
+
+
+# Difference
+: (diff (idx 'Set1) (idx 'Set2))
+-> (1 7 abc "def" (u v w))
+
+
+# Test for subset
+: (not (diff (idx 'Set1) (idx 'Set2)))
+-> NIL  # Set1 is not a subset of Set2
+
+: (not (diff (idx 'Set3) (idx 'Set2)))
+-> T  # Set3 is a subset of Set2
+
+
+# Test for equality
+: (= (idx 'Set1) (idx 'Set2))
+-> NIL
+
+: (= (idx 'Set2) (idx 'Set2))
+-> T