Paiza 問題集「STEP: 3 クラスのメンバの更新」 : https://paiza.jp/works/mondai/class_primer/class_primer__change_member/

solving_problem.rb

class Employee
  attr_accessor :number, :name
  attr_reader :id

  def initialize(id:, number:, name:)
    @id = id.to_i
    @number = number.to_i
    @name = name.to_s
  end
end

class EmployeeRecorder
  attr_reader :employees

  def initialize
    @employees = []
  end

  def make(number, name)
    @employees << Employee.new(id: @employees.size.succ, number:, name:)

    nil
  end

  def getnum(index)
    @employees.each.with_index(1) do |employee, i|
      return employee.number if index.to_i.eql?(i)
    end
  end

  def getname(index)
    @employees.each.with_index(1) do |employee, i|
      return employee.name if index.to_i.eql?(i)
    end
  end

  def change_num(index, new_number)
    @employees.map! do |employee|
      employee.number = new_number.to_i if index.to_i.eql?(employee.id)

      employee
    end

    nil
  end

  def change_name(index, new_name)
    @employees.map! do |employee|
      employee.name = new_name if index.to_i.eql?(employee.id.to_i)

      employee
    end

    nil
  end
end

class Solver
  def solve!
    @employee_recorder = EmployeeRecorder.new
    input_data!

    execution_histories.join("\n")
  end

  private

  def input_data!
    number_of_commands = gets.to_i

    @execution_histories =
      number_of_commands.times.map do
        command, *args = gets.split

        @employee_recorder.public_send(command, *args)
      end
  end

  def execution_histories
    @execution_histories.compact
  end
end

solver = Solver.new
puts solver.solve!