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https://github.com/leo424y/clean-code-ruby

使用 Getter, Setter

Bad:

def make_bank_account
  # ...

  {
    balance: 0
    # ...
  }
end

account = make_bank_account
account[:balance] = 100
account[:balance] # => 100

Good:

class BankAccount
  def initialize
    # this one is private
    @balance = 0
  end

  # a "getter" via a public instance method
  def balance
    # do some logging
    @balance
  end

  # a "setter" via a public instance method
  def balance=(amount)
    # do some logging
    # do some validation
    @balance = amount
  end
end

account = BankAccount.new
account.balance = 100
account.balance # => 100

Good:

class Toy
  attr_accessor :price
end

toy = Toy.new
toy.price = 50
toy.price # => 50