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Add some utility methods for lists of sets.

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This commit is contained in:
Danila Fedorin 2020-12-05 21:48:15 -08:00
parent 48ba4e1577
commit 15f578525d
1 changed files with 13 additions and 0 deletions
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src/advent/util.cr Normal file
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class Array(T)
def union
reduce(T.new) do |l, r|
l | r
end
end
def intersect
reduce do |l, r|
l & r
end
end
end