本文介绍了如何按散列中的值对散列数组进行排序?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
这段 Ruby 代码的行为不像我预期的那样:
This Ruby code is not behaving as I would expect:
# create an array of hashes
sort_me = []
sort_me.push({"value"=>1, "name"=>"a"})
sort_me.push({"value"=>3, "name"=>"c"})
sort_me.push({"value"=>2, "name"=>"b"})
# sort
sort_me.sort_by { |k| k["value"]}
# same order as above!
puts sort_me
我希望通过键值"对散列数组进行排序,但它们打印时未排序.
I'm looking to sort the array of hashes by the key "value", but they are printed unsorted.
推荐答案
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"]}
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