n回までリトライする

integer_attempts.rb

class Integer
  def attempts error_class = StandardError, &block
    fail "Block is required." unless block_given?
    
    1.upto self do |i|
      begin
        return yield i
      rescue error_class => e
        raise e if i == self
        next
      end
    end
  end
end

# example

300.attempts ZeroDivisionError do |i|
  puts "Attempt ##{i}"
  score = rand 101
  puts "Score: #{score}"
  num = score > 95 ? 1 : 0
  1 / num
end

# Attempt #1
# Score: 20
# Attempt #2
# Score: 49
# Attempt #3
# Score: 92
# Attempt #4
# Score: 7
# Attempt #5
# Score: 43
# Attempt #6
# Score: 18
# Attempt #7
# Score: 84
# Attempt #8
# Score: 96
# => 1