bizzare调用Procs的方法？ [英] bizzare way of calling Procs?

问题描述

我找到了一个示例代码：

$ $ p $ def callback（procs）
procs [：var_1]
放置继续
procs [：var_2]
结束

回叫（：var_1 => Proc.new {block_1}，
：var_2 => Proc.new {block_2}）


我找不出方括号 [：var_1] 表示。这是一种叫Porc / lambda的方式吗？我也很困惑，因为用于创建Procs的哈希式方式：

pre $ call $ callback（：start => new {putsCALLBACK的开始}，
：finish => Proc.new {putsCALLBACK的结尾}）

我很感谢这方面的任何帮助。

方法回调被构建，因此它正在接收哈希。这个hash存储每个key的proc，hance执行proc，你需要用hash来使用它的key来修改它：

  hash = {：start => Proc.new {放置CALLBACK的开始}，
：finish => Proc.new {putsCALLBACK的结尾}} 
 
 hash [：start]＃=> proc对象，你可以调用`call`。 
  

I found an example code:

def callback(procs)
  procs[:var_1]
  puts "Proceed"
  procs[:var_2]
end

callback(:var_1 => Proc.new {block_1},
         :var_2 => Proc.new {block_2})

I can't figure out what is in square brackets [:var_1] means. Is this some way to call Porc/lambda? I'm confused also because of the Hash-like way for creating Procs in:

callback(:start => Proc.new {puts "The begining of the CALLBACK"},
         :finish => Proc.new {puts "The ending of the CALLBACK"})

I would appreciate any help on this matter.

解决方案

The method callbacks is build so it is receiving a hash. This hash stores procs against each key, hance to execute the proc you need to fatch it from hash using its key:

hash = { :start => Proc.new {puts "The begining of the CALLBACK"},
         :finish => Proc.new {puts "The ending of the CALLBACK"} }

hash[:start]       #=> proc object you can call `call` on.

这篇关于bizzare调用Procs的方法？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！