performance comparison between grep vs select to get result of array_of_hash

grep_select_benchmark.rb

require 'rubygems'
require 'benchmark'

phone1 = { phone_number: '0434889994', plan: 'standard' }
phone2 = { phone_number: '0452649226', plan: 'standard' }
phone3 = { phone_number: '0434556677', plan: 'data_only' }
phone4 = { phone_numner: '0434889995', plan: 'data_only' }
array_of_hash = [phone1, phone2, phone3, phone4]

proc_find = ->(s) {s[:plan] == 'standard'}

puts "result of grep   : #{ array_of_hash.grep(proc_find) }"
puts "result of select : #{ array_of_hash.select{|s| s[:plan] == 'standard'} }"

Benchmark.bm do |x|
  x.report { 1000000.times { array_of_hash.grep(proc_find) } }
  x.report { 1000000.times { array_of_hash.select{|s| s[:plan] == 'standard'} } }
end

#result of grep   : [{:phone_number=>"0434889994", :plan=>"standard"}, {:phone_number=>"0452649226", :plan=>"standard"}]
#result of select : [{:phone_number=>"0434889994", :plan=>"standard"}, {:phone_number=>"0452649226", :plan=>"standard"}]
#       user     system      total        real
#   1.200000   0.000000   1.200000 (  1.199973)
#   0.810000   0.000000   0.810000 (  0.814260)