require "benchmark"

hash = {'key' => 1, :key => 2}

n = 5_000_000

Benchmark.bm do |x|
  x.report("strings") { n.times { hash['key'] } }
  x.report("symbols") { n.times { hash[:key]  } }
  x.report("strings, set") { n.times { hash['key'] = 1 } }
  x.report("symbols, set") { n.times { hash[:key]  = 1 } }
end