ruby – 从散列值排序的哈希中获取键数组
发布时间：2020-12-17 01:50:04 所属栏目：百科 来源：网络整理
导读：我有一个像这样的哈希 {"red" = 3,"blue" = 1,"yellow" = 3,"green" = 1,"black" = 4} 我想按照散列值的顺序排序并显示前三种颜色,即 ["black","red","yellow"] 我试着做一些像sort_by {| x,y | h [x] = h [y]}和max_by {| x,y | h [x]},但我只得到[“黑色”
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我有一个像这样的哈希
{"red" => 3,"blue" => 1,"yellow" => 3,"green" => 1,"black" => 4}
我想按照散列值的顺序排序并显示前三种颜色,即 ["black","red","yellow"] 我试着做一些像sort_by {| x,y | h [x]< => h [y]}和max_by {| x,y | h [x]},但我只得到[“黑色”].你如何获得前三名？ 解决方法
作为变体：
h = {"green"=>1,"red"=>3,"yellow"=>3,"blue"=>1,"black"=>4}
h.sort_by{ |color,n| -n }.map(&:first).take(3) #=> ["black","yellow"]
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