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rubysinatrastring-formattingcurrency

Format String as Currency with Ruby/Sinatra

I have an app in Ruby/Sinatra that uses an API to return a string that I need to format as currency but don't see any simple way to do this.

Specifically, I'd like a string 665778 to print out as $665,778

I tried implementing Sinatra::Numeric::Helpers but that didn't work and I suspect it's outdated. Please advise. There seems easy to do in Rails but not in Sinatra.

Solution

  • I'd like a string 665778 to print out as $665,778

    Borrowing the thousands-grouping code from this answer yields a succinct solution:

    def number_to_currency(num)
  "$#{num.to_s.gsub(/\d(?=(...)+$)/, '\0,')}"
end