test_sort.rb

gistfile1.rb

require 'benchmark'

class Student
  attr_accessor :name, :age
  
  def initialize(args)
    args.each do |k, v|
      send("#{k}=".to_sym, v)
    end
  end
end

students = []
1_000_000.times do |i|
  students << Student.new(
    name: 'a student',
    age: rand(7) + 18
  )
end

Benchmark.bm(10) do |b|
  b.report('sort') do
    students.sort! { |a, b| a.age <=> b.age }
  end
end


File.open('students_out.txt', 'w+') do |f|
  students.each do |std|
    f.write "#{std.age}\n"
  end
end