Ruby数组删除if并获取删除的对象 [英] Ruby array delete if and get deleted object

问题描述

因此，在这种情况下，我需要有条件地从数组中删除某些内容，这意味着我想遍历数组中的项目并进行测试，然后删除通过测试的内容，然后再获取那删除的项目回来。如果我排除此条件的条件，则 Array＃delete 基本上会执行我想要的操作-返回已删除的项目，但不能有条件地删除。另一方面，delete_if有条件地删除该项目，但将剩余的项目返回到数组中。

So I have this situation where I need to delete something from an array conditionally, meaning that I want to go through the items in the array and do a test and delete the one that passes the test, and then I want to get that deleted item back. If I exclude the conditional aspect of this then Array#delete does what I want basically--returns the deleted item, but can't delete conditionally. On the other hand delete_if removes the item conditionally, but returns the remaining items back in an array.

出于这个问题的目的，假定使用以下类：

For the purposes of this question assume the following class:

class Foo
  def test?
    #returns true or false
  end
end

我可以

index = my_array.index {|a| a.test?}
item_to_delete = my_array[index]
my_array.delete item_to_delete

但是我希望能找到类似的东西：

But I was hoping to find something like:

deleted_item = my_array.delete_if_and_return_deleted {|a| a.test?}

我不必为遍历数组多次而感到兴奋完成此操作：/首先找到目标的索引，第二次获取目标，第三次删除目标。

I'm not thrilled about having to go through the array multiple times to get this done :/ first to find the target's index, second to get the target and third to remove the target. Ick.

有什么想法或建议吗？

推荐答案

您想要什么是分区方法：

deleted_items, kept_items = my_array.partition {|a| a.test?}

这篇关于Ruby数组删除if并获取删除的对象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！