Adding commas to a number

Question

I\'m trying to make a number like 1234567 go to be 1,234,567, but need some help. My thoughts were that I could use a split with \\d{3} and then join a , to that. T

Answer 1

More precise code (handles integers only, as OP did not mention floats!):

def group_digits(n)
  n.to_s.chars
   .reverse
   .each_slice(3)
   .map(&:join)
   .join(",")
   .reverse
end