Ruby 的 sort 不能就地排序.(也许你有 Python 背景?)

Ruby's sort doesn't sort in-place. (Do you have a Python background, perhaps?)

Ruby 有 sort! 用于就地排序，但在 Ruby 1.8 中没有 sort_by 的就地变体.在实践中，你可以这样做:

Ruby has sort! for in-place sorting, but there's no in-place variant for sort_by in Ruby 1.8. In practice, you can do:

sorted = sort_me.sort_by { |k| k["value"] }
puts sorted

从 Ruby 1.9+ 开始，.sort_by! 可用于就地排序:

As of Ruby 1.9+, .sort_by! is available for in-place sorting:

sort_me.sort_by! { |k| k["value"]}