Ruby's pack and unpack explained

Question

Even after reading the standard documentation, I still can\'t understand how Ruby\'s Array#pack and String#unpack exactly work. Here is the example that\'s causing me the most t

Answer 1

We were working on a similar problem this morning. If the array size is unknown, you can use:

ary = ["61", "62", "63"]
ary.pack('H2' * ary.size)
=> "abc"

You can reverse it using:

str = "abc"
str.unpack('H2' * str.size)
=> ["61", "62", "63"]