[英]What is the most efficient way to sort hashes in ruby?
I am trying to sort about 20 hashes in ruby based on one of the attributes of the array. 我正在尝试根据数组的属性之一对红宝石中的20种哈希进行排序。 I want to only return the top 3 hash keys , but I don't want to have to compare each one. 我只想返回前3个散列键 ,但是我不想比较每个散列键 。
Here is an example below of something similar to what I am trying to sort. 这是下面的示例,类似于我要排序的内容。 I want to sort based on powerrank. 我想根据powerrank排序。
["green", {:price=>24.88, :numreviews=>822, :avgStarsRank=>41.0, :reviewsrank=>28, :powerrank=>73.976}]
["steve", {:price=>14.96, :numreviews=>3, :avgStarsRank=>40.0, :reviewsrank=>0, :powerrank=>42.992000000000004}]
["joey", {:price=>40.27, :numreviews=>814, :avgStarsRank=>44.0, :reviewsrank=>28, :powerrank=>80.054}]
["board", {:price=>14.96, :numreviews=>3, :avgStarsRank=>40.0, :reviewsrank=>0, :powerrank=>47}]
["john", {:price=>40.27, :numreviews=>814, :avgStarsRank=>44.0, :reviewsrank=>28, :powerrank=>16}]
For this, all I would want back would an array with ["joey", "green", "board"]. 为此,我只想返回一个带有[“ joey”,“ green”,“ board”]的数组。 Any suggestions on how to tackle this issue? 关于如何解决这个问题有什么建议吗?
Edit: Here is the example in the original hash form: 编辑:这是原始哈希形式的示例:
powerrankings =
{
"green"=>{:price=>24.88, :numreviews=>822, :avgStarsRank=>41.0, :reviewsrank=>28, :powerrank=>73.976},
"steve"=>{:price=>14.96, :numreviews=>3, :avgStarsRank=>40.0, :reviewsrank=>0, :powerrank=>42.992000000000004},
"joey"=>{:price=>40.27, :numreviews=>814, :avgStarsRank=>44.0, :reviewsrank=>28, :powerrank=>80.054}}
"board"=>{:price=>14.96, :numreviews=>3, :avgStarsRank=>40.0, :reviewsrank=>0, :powerrank=>47},
"john"=>{:price=>40.27, :numreviews=>814, :avgStarsRank=>44.0, :reviewsrank=>28, :powerrank=>16}
}
Assuming that powerrankings
is not as you showed but is rather, 假设powerrankings
不是您显示的那样,而是
powerrankings = {
"green" => {:price=>24.88, :numreviews=>822, :avgStarsRank=>41.0, :reviewsrank=>28, :powerrank=>73.976},
"steve" => {:price=>14.96, :numreviews=>3, :avgStarsRank=>40.0, :reviewsrank=>0, :powerrank=>42.992000000000004},
"joey" => {:price=>40.27, :numreviews=>814, :avgStarsRank=>44.0, :reviewsrank=>28, :powerrank=>80.054},
"board" => {:price=>14.96, :numreviews=>3, :avgStarsRank=>40.0, :reviewsrank=>0, :powerrank=>47},
"john" => {:price=>40.27, :numreviews=>814, :avgStarsRank=>44.0, :reviewsrank=>28, :powerrank=>16}
}
then, 然后,
powerrankings.sort_by{|_, h| h[:powerrank]}.reverse.first(3).map(&:first)
# => ["joey", "green", "board"]
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