Took me a while to find out, so ill share 
# 1.8.7 / 1.8.6 only, not 1.9.x
'a'[0] == 97
# universal 1.8.x / 1.9.x
97.chr == 'a'
97 == ?a
# by mr woeber
'a'.unpack('C*').first == 97
[97].pack('C*') == 'a'
My Pragmatic life — a blog by Michael Grosser
Building web applications and fighting the daily madness
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2010-01-18 at 21:23:51
Richard Woeber
The other day I was in need of converting between a String and its representation of ASCII-Codes, which was supposed to work in 1.8.x => 1.9.x.
Odd, because ruby<1.8.7 doesn't have the String#bytes method (and it was a patch for a gem, so I didn't want to monkey-patch String).
The following works from 1.8.? .. 1.9.? (took me also a while to find out, so ill share
'ABC'.unpack('C*') == [65, 66, 67]
[65, 66, 67].pack('C*') == 'ABC'
2010-01-18 at 22:01:59
pragmatig
great, ill add that