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はじめに

移植やってます

self.extend (Python)

class xlist (list):
    def add(self, *args):
        self.extend(args)

class xint (int):
    def add(self, value):
        self += value

x = xlist([1,2,3])
print (x)
x.add (4, 5, 6)
print (x)

x = xint(10)
print (x)
x.add (2)
print (x)

# [1, 2, 3]
# [1, 2, 3, 4, 5, 6]
# 10
# 10

selfに直接extend+ってできるんですね。

どうする? (Ruby)

class Xlist < Array
  def initialize(*args)
    args.each do |x|
      self << x
    end
  end

  def add(*args)
    args.each do |x|
      self << x
    end
  end
end

class Xint < Array
  def initialize(*args)
    args.each do |x|
      self[0].nil? ? self[0] = x : self[0] += x
    end
  end

  def add(*args)
    args.each do |x|
      self[0] += x
    end
  end
end

x = Xlist.new(1, 2, 3)
p x
x.add(4, 5, 6)
p x

x = Xint.new(10)
p x[0]
x.add(2)
p x[0]

# [1, 2, 3]
# [1, 2, 3, 4, 5, 6]
# 10
# 12

トリッキーですが、何とかできました。

メモ

  • Python の self.extend を学習した
  • 道のりは遠そう
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