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  4. Benchmark includes a way to make completing multiple tests more convenient
require 'benchmark'
iterations = 1000000
Benchmark.bm do |bm|
  bm.report("for:") do
    for i in 1..iterations do
      x = i
    end
  end
  bm.report("times:") do
    iterations.times do |i|
      x = i
    end
  end
end