To and from hex nibbles

ruby-talk
1

Hello, I am converting to and from hex nibbles using the code below. Is
there a smarter way for this?

To hex nibbles:
'testing 123'.scan(/./).collect { |i| i.unpack('C')[0].to_s(16) }.join
=> "74657374696e6720313233"

and back to binary:

"74657374696e6720313233".scan(/../).collect { |i| i.to_i(16) }.pack('C*')
=> "testing 123"

Thanks,

/D

2

# 'testing 123'.scan(/./).collect { |i| i.unpack('C')[0].to_s(16) }.join
# => "74657374696e6720313233"
# and back to binary:
# "74657374696e6720313233".scan(/../).collect { |i| i.to_i(16)
# }.pack('C*') # => "testing 123"

s='testing 123'.unpack("H*")[0]
#=> "74657374696e6720313233"

s.scan(/../).map{|i| i.to_i(16)}.pack("C*")
#=> "testing 123"

kind regards -botp

···

From: daniel åkerud [mailto:daniel.akerud@gmail.com]

3

# s.scan(/../).map{|i| i.to_i(16)}.pack("C*")
# #=> "testing 123"

sorry, i missed dblack's scanf

s.scanf("%2x"*s.size).pack("C*")
#=> "testing 123"

kind regards -botp