Created
December 26, 2019 15:14
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| # typed: ignore | |
| # Ruby 2.7 (Pattern Matching) | |
| require 'sorbet-runtime' | |
| class FizzBuzz | |
| extend T::Sig | |
| sig {params(n: Integer).void} | |
| def self.check_number(n) | |
| if n <= 0 then raise ArgumentError end | |
| end | |
| sig {params(n: Integer).returns(T::Boolean)} | |
| def self.is_fizz(n) | |
| check_number(n) | |
| n % 3 == 0 | |
| end | |
| sig {params(n: Integer).returns(T::Boolean)} | |
| def self.is_buzz(n) | |
| check_number(n) | |
| n % 5 == 0 | |
| end | |
| sig {params(n: Integer).returns(T::Array[T.any(Symbol, Integer)])} | |
| def self.number_as(n) | |
| case [is_fizz(n), is_buzz(n)] | |
| in [true, true] | |
| [:FizzBuzz, n] | |
| in [true, false] | |
| [:Fizz, n] | |
| in [false, true] | |
| [:Buzz, n] | |
| else | |
| [:Number, n] | |
| end | |
| end | |
| sig {params(fz: T::Array[T.any(Symbol, Integer)]).returns(String)} | |
| def self.to_str(fz) | |
| case fz | |
| in [:Number, n] | |
| n.to_s | |
| in [s, _] | |
| s.to_s | |
| else | |
| raise ArgumentError | |
| end | |
| end | |
| sig {void} | |
| def self.main() | |
| puts (1..100) | |
| .map(&(method(:number_as) >> method(:to_str))) | |
| .zip((1..100).to_a) | |
| .map{|fzs, n| "#{n} => #{fzs}"} | |
| end | |
| end | |
| if __FILE__ == $PROGRAM_NAME | |
| FizzBuzz.main() | |
| end |
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