require 'benchmark/ips'

$str = File.open( './txt' ).readlines.join(' ')

# 2 + 1 = 3 object
def _gsub(str)
  str.gsub( /\s+/, '' )
end

# 2 + 1 = 3 object
def _gsub!(str)
  str.gsub!( /\s+/, '' )
end


def test_gsubs( word_count, string_count = 1000 )
  arr = Array.new( string_count ) { $str.split.sample(word_count).join(' ') }

  Benchmark.ips do |x|

    x.report('_gsub!') { arr.each{ |str| _gsub!(str) } }
    x.report('_gsub') { arr.each{ |str| _gsub(str) } }
    x.compare!
  end
end