proc return 与 lambda return

Question

为什么 Proc 在 ruby return 中执行调用 Proc 的方法中的剩余代码之前？

def hello
  a = Proc.new{ return }
  a.call
  puts "Hello"
end


def proc
  hello
  puts "Proc"
end

此处return将跳过puts "Hello"并仅打印puts "Proc"

但是 lambda 也打印 puts "Hello"。

这是什么原因？

Answer 1

你应该在这个答案中看到评论。

上面写着

A lambda is an anonymous method. Since it's a method, it returns a value, and the method that called it can do with it whatever it wants, including ignoring it and returning a different value.

A Proc is like pasting in a code snippet. It doesn't act like a method. So when a return happens within the Proc, that's just part of the code of the method that called it

proc return 与 lambda return

proc return vs lambda return

ruby

lambda

proc