Ruby: block 和产量

Question

我遇到了这个关于使用 blocks e 然后用 yield 调用它们的练习。它看起来像这样:

class Hero
  def initialize(*names)
    @names = names
  end
  def full_name
    # a hero class allows us to easily combine an arbitrary number of names
    # this is where yield should be
  end
end

def names
  heroes = [Hero.new("Christopher", "Alexander"),
            Hero.new("John", "McCarthy"),
            Hero.new("Emperor", "Joshua", "Abraham", "Norton")]
  # I have to use #map and #join to unify names of a single hero
end

返回值应该是这样的:

["Christopher Alexander", "John McCarthy", "Emperor Joshua Abraham Norton"]

我知道如何使用 block 和 yield 。在此之前我做了非常简单的练习，但我无法解决这个问题。

Answer 1

使用Array#join .您不需要 yield 或任何花哨的东西。