How to obtain the binary literal from a integer in Ruby?

Question

I would like to get the binary literal corresponding from a given integer, in this way:

4.to_literal => 0b100

Is there such to_literal method?

Answer 1

Use to_s with its optional base parameter to get a string.

4.to_s(2) #=> "100"

You can't get a literal as output.

Answer 2

Use String#% or Kernel#sprintf (%#b as format specifier):

'%#b' % 4
# => "0b100"
sprintf('%#b', 4)
# => "0b100"