ruby - 有什么方法可以检查数组中的哈希值是否包含 ruby​​ 中的相似键值对？

Question

比如我有

array = [ {name: 'robert', nationality: 'asian', age: 10},
          {name: 'robert', nationality: 'asian', age: 5},
          {name: 'sira', nationality: 'african', age: 15} ]

我想得到的结果是

array = [ {name: 'robert', nationality: 'asian', age: 15},
          {name: 'sira', nationality: 'african', age: 15} ]

因为有 2 个 Robert 具有相同的国籍。

如有任何帮助，我们将不胜感激。

我试过 Array.uniq! {|e| e[:name] && e[:nationality] } 但我想将两个数字都添加到 10 + 5

的两个哈希值中

P.S:数组可以有 n 个哈希值。

Answer 1

我会从这样的事情开始:

array = [ 
  { name: 'robert', nationality: 'asian', age: 10 },
  { name: 'robert', nationality: 'asian', age: 5 },
  { name: 'sira', nationality: 'african', age: 15 } 
]
array.group_by { |e| e.values_at(:name, :nationality) }
     .map { |_, vs| vs.first.merge(age: vs.sum { |v| v[:age] }) }
#=> [
#     {
#       :name        => "robert",
#       :nationality => "asian",
#       :age         => 15
#     }, {
#       :name        => "sira",
#       :nationality => "african",
#       :age         => 15
#     }
#   ]