Struct vs Hash initialized from Arrays

benchmark.rb

require "benchmark"

fields = [:f1, :f2, :f3, :f4, :f5, :f6]
struct = Struct.new("Something", *fields)

values_array = 10_000.times.map {
  [rand(10000), rand(10000), rand(10000), rand(10000), rand(10000), rand(10000)]
}

Benchmark.bm(10) do |x|
  x.report("Hash") do
    values_array.each do |values|
      Hash[fields.zip(values)]
    end
  end
  x.report("Struct") do
    values_array.each do |values|
      struct.new(*values)
    end
  end
end

gistfile1.txt

$ ruby benchmark.rb
               user     system      total        real
Hash       0.030000   0.000000   0.030000 (  0.028927)
Struct     0.000000   0.000000   0.000000 (  0.005513)