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youcune/to_hex.rb

Last active October 1, 2016 01:48
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Rubyプログラミングキャンプ2016の課題
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to_hex.rb
#!/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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