- Ruby 初心者スレッド Part 54
569 ：デフォルトの名無しさん[sage]：2014/04/11(金) 08:22:18.07 ID:FCtgIT4m - >>568
irb(main):001:0> require 'pp'
=> true
irb(main):002:0> pp [
irb(main):003:1* {name:"Tanaka", city:"X"},
irb(main):004:1* {name:"Tanaka", city:"Y"},
irb(main):005:1* {name:"Tanaka", city:"Y"},
irb(main):006:1* {name:"Suzuki", city:"X"},
irb(main):007:1* {name:"Sato", city:"Z"}
irb(main):008:1> ].each_with_object({}){|l,h|h[l]=h.size unless h[l]}.sort{|a,b|a[1]<=>b[1]}.map{|x|x[0]}
[{:name=>"Tanaka", :city=>"X"},
{:name=>"Tanaka", :city=>"Y"},
{:name=>"Suzuki", :city=>"X"},
{:name=>"Sato", :city=>"Z"}]
=> [{:name=>"Tanaka", :city=>"X"}, {:name=>"Tanaka", :city=>"Y"}, {:name=>"Suzuki", :city=>"X"}, {:name=>"Sato", :city=>"Z"}]
|