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baweaver/pattern_matching_cons.rb

Created December 14, 2019 00:29
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pattern_matching_cons.rb
Cons = Struct.new(:head, :tail)
case Cons[1, Cons[2]]
in Cons[head. tail] then [head, tail]
end
# => [1, #<struct Cons head=2, tail=nil>]
case Cons[1, Cons[2]]
in Cons[1, Cons[head, tail]] then [head, tail]
end
# => [2, nil]
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