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"

Answer 1

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"