“k.send:你好"- 如果 k 是“接收者"，那么谁是发送者? [英] "k.send :hello" - if k is the "receiver", who is the sender?

问题描述

在下面的例子中，为什么我们说k.send :hello"而不是k.receive :hello"如果，如别处所述，k实际上是接收者?

In the example below, why do we say "k.send :hello" instead of "k.receive :hello" if, as stated elsewhere, k is actually the receiver?

它听起来就像 k 是发送者而不是接收者.

It sounds like k is the sender rather than the receiver.

当我们说k.send :hello"时，谁在发送，如果不是 k?

When we say "k.send :hello" who is sending, if not k?

(你和我一样困惑吗?)

(Are you as confused as I am?)

class Klass
  def hello
    "Hello!"
  end
end
k = Klass.new
k.send :hello   #=> "Hello"
k.hello         #=> "Hello"

推荐答案

任何包含此代码的对象都在发送消息——大概是主要的.让我们用更明确的对象和正常的消息传递来看看它.

Whatever object contains this code is sending the message — presumably main. Let's look at it with more explicit objects and normal message-passing.

class Person
  attr_accessor :first_name, :last_name
  def initialize(first_name, last_name)
    @first_name, @last_name = first_name, last_name
  end
  def marry(other)
    self.last_name = other.last_name
  end
end

bob = Person.new('Bob', 'Smith')
patty = Person.new('Patricia', 'Johnson')

patty.marry bob

在这段代码的最后一行，main 发送 marry 给 patty，patty 依次发送自己 last_name= 并发送 bob last_name.

In the last line of this code, main is sending marry to patty, and patty in turn sends herself last_name= and sends bob last_name.

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