Ruby 方法定义语法与 &关键词

发布于 2025-01-20 05:59:02 字数 257 浏览 1 评论 0原文

class ExchangeUtil
  def exchange_to(other_currency, date = Date.current, &)
      @bank.exchange_with_on(self, other_currency, date, &)
  end
end

在方法定义和方法调用中， ＆amp＆amp; 的siginciencience是什么？

原文

class ExchangeUtil
  def exchange_to(other_currency, date = Date.current, &)
      @bank.exchange_with_on(self, other_currency, date, &)
  end
end

What is the siginificance of & in method definition and method calls?

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苍暮颜 2025-01-27 05:59:02

是 Ruby 3.1 中的一项新功能：匿名块参数

这只是当您有一个函数的块参数时的快捷方式，该函数的唯一目的是传递给另一个函数。较旧的语法是

class ExchangeUtil
  def exchange_to(other_currency, date = Date.current, &block)
      @bank.exchange_with_on(self, other_currency, date, &block)
  end
end

参数 &block 可以有任何名称，例如 &my_block，但该名称通常毫无意义，所以他们做了它“匿名的”。

It's a new feature in Ruby 3.1: Anonymous block argument

It's just a shortcut for when you have a block argument for a function whose only purpose is to be passed to another function. Older syntax for that would've been

class ExchangeUtil
  def exchange_to(other_currency, date = Date.current, &block)
      @bank.exchange_with_on(self, other_currency, date, &block)
  end
end

The param &block could've had any name, like &my_block, but the name was generally meaningless, so they made it "anonymous".

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