Set

Arturo

<lang rebol>a: [1 2 3 4] b: [3 4 5 6]

print in? 3 a print contains? b 3

print union a b print intersection a b print difference a b print difference.symmetric a b

print a = b

print subset? [1 3] a print subset?.proper [1 3] a print subset? [1 3] [1 3] print subset?.proper [1 3] [1 3]

print superset? a [1 3] print superset?.proper a [1 3] print superset? [1 3] [1 3] print superset?.proper [1 3] [1 3]</lang>

Output:

true
true
1 2 3 4 5 6 
3 4 
1 2 
1 2 5 6 
false
true
true
true
false
true
true
true
false