从字典数组中删除重复的字典

Question

如何从字典数组中删除重复的字典。

回复：

[  
   {  
      "voter_id":1
   },
   {  
      "passport":1
   },
   {  
      "pan_card":1
   },
   {  
      "aadhaar_card":1
   },
   {  
      "voter_id":1
   },
   {  
      "aadhaar_card":1
   }
]

我们需要类似下面的输出

[  
       {  
          "passport":1
       },
       {  
          "pan_card":1
       },
       {  
          "aadhaar_card":1
       },
       {  
          "voter_id":1
       }

    ]

我正在尝试此链接，但无济于事。

Swift 3.0 Remove duplicates in Array of Dictionaries

Answer 1

只需将[String: Int]的数组转换为Set

var foo = [
[
    "voter_id":1
],
[
    "passport":1
],
[
    "pan_card": 1
],
[
    "aadhaar_card":1
],
[
    "voter_id":1
],
[
        "aadhaar_card":1
    ]
]
Set(foo) // Usage 

Answer 2

如果要删除重复的密钥，请尝试此操作

func removeDuplicate(list: [[String:Any]]) -> [[String:Any]] {
    var alreadyKnowKeys: [String] = []
    var newArray: [[String:Any]] = []

    list.forEach { (item) in
        if let key = item.keys.first {
            if !alreadyKnowKeys.contains(key) {
                newArray.append(item)
                alreadyKnowKeys.append(key)
            }
        }

    }

    return newArray
}