是否开始...结束 while 表示一个“块"? [英] Does begin . . . end while denote a 'block'?

问题描述

temp = 98.3
begin
  print "Your temperature is " + temp.to_s + " Fahrenheit. "
  puts "I think you're okay."
  temp += 0.1
end while temp < 98.6

在上面的例子中，begin 和 end 之间的所有东西都是一个块吗?

In the above example, is everything between begin and end a block?

我仍然对块是什么感到困惑.

I'm still confused what a block is.

如果你不能称它为一个块，你会称它开始和结束之间的那段代码是什么?可以称之为块吗?

If you can't call it a block, what would you call that chunk of code between begin and end? Is it ok to call it a chunk?

推荐答案

Block 在 Ruby 中有特殊的含义.根据 Ruby 的创建者 Matz 的说法，您可以将块视为无名函数 - 通常可以被yield输入的东西，也可以取参数.

Block has a special meaning in Ruby. According to Matz, Ruby's creator, you can look at a block as a nameless function - typically something that can be yielded into, and which may also take parameters.

在描述 Ruby 语法时，您可能会看到以下类型的歧义:

You may see the following kind of disamiguation when describing Ruby syntax:

• begin...end(在其他语言中称为块)有时可以简单地称为它是什么，即表达式(可能在转包含其他表达式 - 表达式只是具有返回值的东西)在 Ruby 中.一些参考文献仍将其称为begin/end block，或code block，增加了一些混乱
• do...end 或 {...} 将始终被称为 阻止在 Ruby 中

• begin...end (what is called block in other languages) may sometimes be referred to simply as what it is, i.e. an expression (which may in turn contain other expressions - an expression is simply something that has a return value) in Ruby. Some references will still call it a begin/end block, or a code block, adding somewhat to the confusion
• do...end or {...} will always be referred to as a block in Ruby

例如，仔细阅读Ruby 语法手册页，例如

begin 表达式 end
表达式 while 表达式
loop block

begin expression end
expression while expression
loop block

如需进一步阅读，请参阅:

For further reading, see:

• Ruby 编程
• Ruby(来自其他语言)
• 更多、更多文档

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