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Rubyプログラミングキャンプ2016の課題
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| #!/usr/bin/env ruby | |
| def to_hex(*args) | |
| raise ArgumentError, '0-255の範囲のIntegerで指定してね' if args.any? { |_| !_.kind_of?(Integer) || !(0..255).include?(_) } | |
| "##{args.map { |_| '%02x' % _ }.join}" | |
| end | |
| # test | |
| p to_hex(0, 0, 0) | |
| p to_hex(15, 16, 255) | |
| p to_hex(255, 255, 255) | |
| p to_hex(256, 256, 256) |
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