更改在 .each 循环中引用的数组元素的值? [英] Change value of array element which is being referenced in a .each loop?

问题描述

如何实现以下操作:我想更改在 .each 循环中的管道字符之间引用的数组元素的值.

How do I get the following to happen: I want to change the value of an array element which is being referenced between pipe characters in a .each loop.

以下是我想做但目前不起作用的示例:

Here is an example of what I want to do, but is not currently working:

x = %w(hello there world)
x.each { |element|
   if(element == "hello") {
       element = "hi" # change "hello" to "hi"
   }
}
puts x # output: [hi there world]

很难找到这么笼统的东西.

It's hard to look up something so general.

推荐答案

您可以使用 collect! 或 map! 修改数组中的数组来得到您想要的结果-地点:

You can get the result you want using collect! or map! to modify the array in-place:

x = %w(hello there world)
x.collect! { |element|
  (element == "hello") ? "hi" : element
}
puts x

在每次迭代中，元素被块返回的值替换到数组中.

At each iteration, the element is replaced into the array by the value returned by the block.

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