Ruby :从散列数组生成散列的散列

Question

我有以下几点

friends = [{ name: "Jack", attr1:"def", attr2:"def" }, { name: "Jill", attr1:"def", attr2:"def" }]

我想将上面的表示形式转换为散列形式，如下所示

friends = { "Jack" => { attr1: "def", attr2:"def" }, "Jill" => { attr1: "def", attr2: "def" } }

在Ruby中有什么优雅的方式做到这一点吗？

Answer 1

Hash[friends.map { |f| _f = f.dup; [_f.delete(:name), _f] }]
# => {"Jack"=>{:attr1=>"def", :attr2=>"def"}, "Jill"=>{:attr1=>"def", :attr2=>"def"}}

Answer 2

friends.each_with_object({}) do |f, o|
    f = f.dup
    o[f.delete :name] = f
end

Answer 3

hash = {}
friends.each{|h| hash[h.delete(:name)] = h }
# => {"Jack"=>{:attr1=>"def", :attr2=>"def"}, "Jill"=>{:attr1=>"def", :attr2=>"def"}}