Ruby Fundamental - Hash em Ruby (parte I)

hash_01.rb

even_numbers = {}          # Cria um objeto hash vazio

even_numbers["zero"] = 0   # Atribui 0 como valor para a chave "zero"
even_numbers["two"] = 2
even_numbers["four"] = 4

even_numbers["two"]        # Recupera 2 como valor

hash_02.rb

even_numbers = {}
even_numbers[:zero] = 0
even_numbers[:two] = 2
even_numbers[:four] = 4

hash_03.rb

even_numbers = { :zero => 0, :two => 2, :four => 4 }

hash_04.rb

even_numbers = { zero: 0, two: 2, four: 4 }

hash_05.rb

misc_hash = {
  :string => "Some text",
  :number => 456,
  :boolean => false,
  :array => [0, 1, 2]
}

hash_06.rb

even_numbers = { :zero => 0, :two => 2, :four => 4 }
even_number.each do |key, value|
  print "|#{key}: #{value}| "
end

# Imprime "|zero: 0| |two: 2| |four: 4| "

hash_07.rb

even_numbers = { :zero => 0, :two => 2, :four => 4 }
even_number.each_key { |key| print "#{key} " }
# Imprime "zero two four "

even_number.each_value { |value| print "#{value} " }
# Imprime "0 2 4 "

hash_08.rb

class OrdersController < ApplicationController
  def payment
    @order = Order.find_by_number params[:id]
    @payment_method = PaymentMethod.find params[:payment_method_id]
    # Alguma implementação
  end

  # Mais ações
end

hash_09.rb

class ShippingCalculator
  def calculate(weight, height, width, depth)
    # Alguma implementação
  end
end

hash_10.rb

class ShippingCalculator
  def calculate(weight, dimensions = {})
    # Alguma implementação
  end
end

dimensions = { :height => 0.75, :width => 1.00, :depth => 0.10 }

calc = ShippingCalculator.new
calc.calculate 1.50, dimensions