ruby 方法 - 如何减少方法中的参数数量？

Question

我知道参数越少越好，超过 2 个(或 3 个或 4 个，具体取决于文献)是一种代码味道。

如果我有带有参数的代码，例如:

class DoubleSeries
  def self.generate_sequences(seq1_start, seq2_start, seq1_step, seq2_step, iterations)
    seq1,seq2=seq1_start,seq2_start
    result=[]
    (1..iterations).each do
      result << seq1 << seq2
      seq1+=seq1_step
      seq2+=seq2_step
    end
    result
  end
end

当参数都为一个函数服务时，如何将参数数量从 5 个减少？

Answer 1

我想如果你想全力以赴严格遵守 Sandi Metz rules那么 OOP 方式就是要走的路。

class Sequence
  attr_reader :start, :step

  initialize(start, step)
    @start = start
    @step = step
  end
end

sequence_1 = Sequence.new(seq1_start, seq1_step)
sequence_2 = Sequence.new(seq2_start, seq2_step)

class DoubleSeries
  def self.generate_sequences(sequence_1, sequence_2, iterations)
    item_1, item_2 = sequence_1.start, sequence_2.start
    result=[]
    iterations.times do
      result << item_1 << item_2
      item_1 += sequence_1.step
      item_2 += sequence_2.step
    end
    result
  end
end

[我的代码(迈克尔):