gistfile1.rb

# how to I tell if an array includes all elements of another array?

[1,2,3].include? [1,2,3] => false # expects single element

[[1,2,3]].include? [1,2,3] => true # works if ordered and includes all

[[1,3,2]].include? [1,2,3] => false # fails if unordered

[[1,3,2].sort].include? [1,2,3].sort => true # passes if ordered

[[1,2,3]].include? [1,2] => false => # fails because it expects the full array

# fallback on uniq! ?

items = [1,2,3,4]
[5,6,7].each { |a| items << a }
[5,6,7].each { |a| items << a }
items # => [1, 2, 3, 4, 5, 6, 7, 5, 6, 7]
items.uniq! # => [1, 2, 3, 4, 5, 6, 7]