Pretty file size in Ruby?

Question

I\'m trying to make a method that converts an integer that represents bytes to a string with a \'prettied up\' format.

Here\'s my half-working attempt:

Answer 1

Here is a method using log10:

def number_format(n)
   n2 = Math.log10(n).to_i / 3
   return '%.3f' % (n / 1e3 ** n2) + ['', ' k', ' M', ' G'][n2]
end

s = number_format(9012345678e0)
puts s == '9.012 G'

https://ruby-doc.org/core/Math.html#method-c-log10