Convert a string of 0-F into a byte array in Ruby

For a string str:

"".tap {|binary| str.scan(/../) {|hn| binary << hn.to_i(16).chr}}

To get Integer — just str.hex. You may get byte array in several ways:

str.scan(/../).map(&:hex)
[str].pack('H*').unpack('C*')
[str].pack('H*').bytes.to_a

See other options for pack/unpack here: http://ruby-doc.org/core/classes/String.html#method-i-unpack

And examples here: http://www.codeweblog.com/ruby-string-pack-unpack-detailed-usage/

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