Shortest hex2bin in ruby?

Question

Whats the shortest way to convert hex string to binary string in ruby? for example:

class
  def hex2bin

  end
end

"AB12345678".hex2bin

score 3 · Answer 1 · answered Mar 09 '11 at 10:38

3

class String
  def hex2bin
    scan(/../).map { |x| x.to_i(16).chr }.join
  end
end

"AB12345678".hex2bin #=> "\xAB\x124Vx"

answered Mar 09 '11 at 10:38

Paige Ruten

2

you can also do `chars.each_slice(2).map { |x| x.join.to_i(16).chr }.join` which is a bit longer, but likely more efficient because it does not use a regex to extract the char pairs. – Theo Mar 10 '11 at 06:07

c2h2 · Accepted Answer · 2011-03-10T05:52:48.943

2

def hex2bin
  [self].pack "H*"
end

Just found out the pack() function, I think this also works!

edited Mar 10 '11 at 05:52

answered Mar 09 '11 at 11:04

c2h2

2 Answers2