Back

```
require "benchmark/ips"
class String
def commafy_rev = reverse.scan(/(?:\d*\.)?\d{1,3}-?/).join(",").reverse
def commafy_fwd1 = gsub(/(?!\A)(?=(?:\d{3})+\z)/, ",")
def commafy_fwd2 = scan(/^\d{#{size % 3}}|\d{3}/).join ","
def commafy_fwd3 = (n = size % 3; [self[0...n], self[n..].scan(/\d{3}/)].join ",")
end
str = "32432908"
methods = %i[commafy_fwd1 commafy_fwd2 commafy_fwd3 commafy_rev]
Benchmark.ips_quick(*methods, on:str)
puts
Benchmark.ips_quick(methods, on:(str\*50))
```