bm.rb

search_for = '46846'

value = '00000'

stats = []

search_for.size.times do |index|
  stats[index] ||= []

  10.times do |digit|
    value[index] = digit.to_s

    puts "checking #{value}"

    start_time = Time.now

    10_000_000.times { search_for == value }

    running_time = Time.now - start_time

    stats[index] << { running_time: running_time, digit: digit}

    puts "For #{digit} at #{index}: #{running_time}"
  end

  # setting slowest
  value[index] = stats[index].sort { |stat1, stat2| stat1[:running_time] <=> stat2[:running_time] }.last[:digit].to_s
end

puts "Is it #{value}?"