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certainty/leap.rb

Created September 18, 2015 06:22
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leap.rb
def leap_year?(year)
year.modulo(400).zero? || year.modulo(4).zero? && !year.modulo(100).zero?
end
def leap_years(range = 1..Float::INFINITY)
range.lazy.select(&method(:leap_year?))
end
# Examples
leap_years.take(20).to_a
leap_years(1900..2020).to_a
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