ljust speed test

speedtest.rb

# just speed test for http://stackoverflow.com/questions/11502629/how-to-do-number-to-string-suffix/11502715#11502715

# if we properly test int<->str conversion the log_10 method is about 30% faster

begin
  int = 5

  a = Time.now.to_f
  10_000_000.times { int.to_s.ljust(3, "0").to_i }
  puts Time.now.to_f - a # => 1.3s

  a = Time.now.to_f
  10_000_000.times { int * 10**(3 - Math.log10(int).to_i - 1) }
  puts Time.now.to_f - a # => 1s
end