lambda_when_case.rb

class CaseTest
  def initialize(number)
    @number = number
  end

  def test
    case @number
    when it_is_eight?
      'eight'
    when it_is_five?
      'five'
    else
      'whatever'
    end
  end

  private

  def it_is_eight?
    ->(n) { n == 8 }
  end

  def it_is_five?
    ->(n) { n == 5 }
  end
end

puts CaseTest.new(5).test
puts CaseTest.new(8).test
puts CaseTest.new(15).test