Basic Array Operations in Ruby
Handling Arrays is key, and this can make things really simple.
x = [1,2,3]
y = [2,3,4,5]
#intersection
x & y
# => [2,3]
# union
x | y
# => [1,2,3,4,5]
# difference
x - y
# => [1]
# combination
x + y
# => [1,2,3,2,3,4,5]
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