Gopal Gopal - 1 year ago 52
Ruby Question

Removing trailings zeros in string

I have a string and I need to remove trailing zeros after

and possibly the

remove_zeros("1,2,3,4.2300") #=> "1,2,3,4.23"
remove_zeros("1,2,3,4.20300") #=> "1,2,3,4.203"
remove_zeros("1,2,3,4.0200") #=> "1,2,3,4.02"
remove_zeros("1,2,3,4.0000") #=> "1,2,3,4"

How could I do this in Ruby? I tried with converting into
but it terminates the string when I encounter a
. Can I write any regular expression for this?


First, you need to parse the string into its component numbers, then remove the trailing zeros on each number. This can be done by:

1) splitting the string on ',' to get an array of numeric strings

2) for each numeric string, convert it to a Float, then back to a string:

#!/usr/bin/env ruby

def parse_and_trim(string)
  number_strings = string.split(',') { |s| Float(s).to_s }.join(',')

p parse_and_trim('1,2,3,4.2300') # => "1.0,2.0,3.0,4.23"

If you really want to remove the trailing '.0' fragments, you could replace the script with this one:

#!/usr/bin/env ruby

def parse_and_trim_2(string)
  original_strings = string.split(',')
  converted_strings = { |s| Float(s).to_s }
  trimmed_strings = do |s|
    s.end_with?('.0') ? s[0..-3] : s

p parse_and_trim_2('1,2,3,4.2300') # => "1,2,3,4.23"

These could of course be made more concise, but I've used intermediate variables to clarify what's going on.