問題描述
在 Ruby 中，“接收者”指的是什麼？ (In Ruby what does the "receiver" refer to?)
I'm reading a document that talks about a method having a receiver. What's a receiver?
參考解法
方法 1:
In Ruby (and other languages that take inspiration from SmallTalk) objects are thought of as sending and receiving 'messages'.
In Ruby, Object, the base class of everything, has a send method: Object.send For example:
class Klass
def hello
"Hello!"
end
end
k = Klass.new
k.send :hello #=> "Hello!"
k.hello #=> "Hello!"
In both of these cases k is the receiver of the 'hello' message.
方法 2:
In the original Smalltalk terminology, methods on "objects" were instead refered to as messages to objects (i.e. you didn't call a method on object foo, you sent object foo a message). So foo.blah is sending the "blah" message, which the "foo" object is receiving; "foo" is the receiver of "blah".
方法 3:
the object before the .
think of calling a method x.y as saying "send instruction y to object x".
it's the smalltalk way of thinking, it will serve you well as you get to some of Ruby's more advanced features.
(by lorz、Cameron Pope、Adam Wright、chillitom)