Convert string to hexadecimal in Ruby

Ruby 1.9 added an even easier way to do this: "0x101".hex will return the number given in hexadecimal in the string.

Change this line:

line = a.map { |b| ", #{b}" }.join

to this:

line = a.map { |b| sprintf(", 0x%02X",b) }.join

(Change to %02x if necessary, it's unclear from the example whether the hex digits should be capitalized.)

I don't know if this is the best solution, but this a solution:

class String
  def to_hex
    "0x" + self.to_i.to_s(16)
  end
end

"116".to_hex
   => "0x74"

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