alexgriff

require 'benchmark'

TEN = 10
ONE_HUNDRED = 100
ONE_THOUSAND = 1000
TEN_THOUSAND = 10000
ONE_HUNDRED_THOUSAND = 100000
ONE_MILLION = 1000000
TEN_MILLION = 10000000
ONE_HUNDRED_MILLION = 100000000

alexgriff

TEN = 10
ONE_HUNDRED = 100
ONE_THOUSAND = 1000
TEN_THOUSAND = 10000
ONE_HUNDRED_THOUSAND = 100000
ONE_MILLION = 1000000
TEN_MILLION = 10000000
ONE_HUNDRED_MILLION = 100000000

alexgriff

def generate_ten_random_numbers
  (0...TEN).map { |generator| rand(TEN) }
end

def generate_one_hundred_random_numbers
  (0...ONE_HUNDRED).map { |generator| rand(ONE_HUNDRED) }
end

def generate_one_thousand_random_numbers
  (0...ONE_THOUSAND).map { |generator| rand(ONE_THOUSAND) }

alexgriff

Benchmark.bm do |test|
  ten_random_numbers = generate_ten_random_numbers
  test.report("10 test:         ") {ten_random_numbers.sort!}
  puts "top five: #{ten_random_numbers[0..4]}\n\n"

  one_hundred_random_numbers = generate_one_hundred_random_numbers
  test.report("100 test:        ") {one_hundred_random_numbers.sort!}
  puts "top five: #{one_hundred_random_numbers[0..4]}\n\n"

  one_thousand_random_numbers = generate_one_thousand_random_numbers

alexgriff

# Return an array of length n_simulations.
# Each value is a random number between 0 and @n_doors-1.
# The value represents the door the prize is behind
# or the door the contestant guessed.

@n_doors = 3

def simulate_prizedoors(n_simulations)
  (0...n_simulations).map {rand(@n_doors)}
end

alexgriff

candidate = FactoryGirl.create :candidate, :with_many_voters
# => <Candidate id: 1534, position_running_for: "President", first_name: "Rudolph", 
# last_name: "Carter", personality_type: "Brave, Hasty", 
# bio: "Ut molestiae maiores non corporis. Voluptatem eum ...", political_views: nil, national_candidate: true>

candidate.votes
# => #<ActiveRecord::Associations::CollectionProxy 
# [#<Vote id: 1544, voter_id: 556, candidate_id: 1534>, 
# #<Vote id: 1545, voter_id: 557, candidate_id: 1534>, ...
# #<Vote id: 1553, voter_id: 565, candidate_id: 1534>]>

alexgriff

class MakeVoterPolymorphic < ActiveRecord::Migration
  def change
    add_column :voters, :voterable_id, :integer
    add_column :voters, :voterable_type, :string
  end
end

# you could also use a shortened syntax that would do the same thing
# and add these two columns to the table

alexgriff

# Voter, the polymorphic model
class Voter < ActiveRecord::Base
  belongs_to :voterable, polymorphic: true

  has_many :votes
  has_many :candidates, through: :votes
end

# Citizen, has one voter as voterable
# this is a new model where many of the attributes 

alexgriff

# - create a candidate
# --------------------

obama = Candidate.create(first_name: "Barack", last_name: "Obama", birthdate:"08-04-1961", 
        position_running_for: "President", national_candidate: true)
# (0.1ms)  begin transaction
# SQL (0.3ms)  INSERT INTO "candidates" ("first_name", "last_name", "birthdate", "position_running_for", "national_candidate") VALUES (?, ?, ?, ?, ?)  [["first_name", "Barack"], ["last_name", "Obama"], ["birthdate", "1961-04-08"], ["position_running_for", "President"], ["national_candidate", "t"]]
# (1.4ms)  commit transaction
# => #<Candidate id: 1544, position_running_for: "President", first_name: "Barack", last_name: "Obama", 
#    birthdate: "1961-04-08",  national_candidate: true > 

alexgriff

array = [[1],[2],[3]]

# 1 will it error? / name that error!
# 1a.
array.first + 1

# 1b.
array.first.first + 2

# 1c.