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require 'benchmark'

iterations = 100_000

Benchmark.bm(27) do |bm|
  bm.report('finding in hash') do
    iterations.times do
      arr.find{|h| h['start_date'] == '2018'}
    end
  end

  bm.report('detect in hash') do
    iterations.times do
     arr.detect{|h| h['start_date'] == '2018'}
    end
  end

  bm.report('select in hash') do
    iterations.times do
      arr.select{|h| h['start_date'] == '2018'}
    end
  end
end