struct_vs_hash.rb

#!/usr/bin/env ruby

require 'benchmark'

# Struct
s = Struct.new(:foo, :bar, :baz)
s = s.new(nil, nil, nil)

# Hash
h = {foo: nil, bar: nil, baz: nil}

n = 5000000
Benchmark.bm do |m|
  # test assignment and access for Hash and Struct
  m.report { n.times do; h[:foo] = n, h[:bar] = n, h[:baz]; end }
  m.report { n.times do; s.foo = n, s.bar = n, s.baz = n; end }
end

# $ ruby struct_vs_hash.rb
#       user     system      total        real
#   1.510000   0.010000   1.520000 (  1.548214)
#   2.120000   0.030000   2.150000 (  2.227257)