Ruby: Hexadecimal String to Binary String

Question

I'm curious what's the best way to convert hexadecimal string to binary string in Ruby.

I.e.

def get_binary_string( hex_string )
  # what's the best way?
end

puts get_binary_string("2F")
output> "00101111"

Dylan Markow · Accepted Answer · 2012-03-29 00:19:36Z

5

You could convert the hex 2F to an integer (47), and then convert it back to a binary string (101111):

"2F".to_i(16).to_s(2)
# => "101111"

answered Mar 29, 2012 at 0:19

Dylan Markow

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1 Comment

What if the hexadecimal string is very long and the integer conversion overflows?