在Ruby中映射哈希键

Question

如果我有哈希

{"one"=>1, "two"=>2, "three"=>3}

映射键以获取数组的最佳方法是什么:

["one", "two", "three"]

Answer 1

{"one"=>1, "two"=>2, "three"=>3}.keys #=> ["one", "two", "three"]

该文档非常适合发现这些问题的答案.

如果问题是"我如何从Y型对象获取X数据？",那么通过对象类型Y的文档阅读应该是你要去的第一个地方.

Answer 2

{"one"=>1, "two"=>2, "three"=>3}.keys