Cleaned up the average timing benchmark.

benchmark/benchmark_helper.rb

@@ -20,3 +20,27 @@ end
 def read_html
   return File.read(File.expand_path('../fixtures/gist.html', __FILE__))
 end
+
+##
+# Benchmarks the average runtime of the given block.
+#
+# @param [Fixnum] amount The amount of times to call the block.
+# @param [Fixnum] precision
+#
+def measure_average(amount = 10, precision = 3)
+  timings = []
+
+  amount.times do |iter|
+    timing = Benchmark.measure { yield }.real
+
+    timings << timing.real
+
+    puts "Iteration: #{iter + 1}: #{timing.real.round(precision)}"
+  end
+
+  average = timings.inject(:+) / timings.length
+
+  puts
+  puts "Iterations: #{amount}"
+  puts "Average:    #{average.round(precision)} sec"
+end

benchmark/lexer/big_xml_average.rb

@@ -1,21 +1,7 @@
 require_relative '../benchmark_helper'
 
 xml = read_big_xml
-amount  = 10
-timings = []
 
-amount.times do |i|
-  timing = Benchmark.measure do
+measure_average do
   Oga::XML::Lexer.new(xml).advance { }
 end
-
-  puts "Iteration #{i + 1}: #{timing.real.round(3)}"
-
-  timings << timing.real
-end
-
-average = timings.inject(:+) / amount
-
-puts
-puts "Iterations: #{amount}"
-puts "Average:    #{average.round(3)} sec"