Swift - 根據自定義條件將數組轉換為字典

Question

如果我有以下形式的對象數組：

[{ userId: 3, data: "bla bla"} , { userId: 2, data: "bla bla"}, { userId: 3, data: "bla bla2"}, { userId: 1, data: "bla bla"}, { userId: 1, data: "bla bla2"}]

我可以將其轉換為以userId為鍵的字典，如下所示：

let dict = Dictionary(grouping: myData, by: {$0.userId})

但是如果我知道我的用戶有userId 3並且我想創建一個這樣的字典怎么辦：

{
   key: "me",
   value: [{ userId: 3, data: "bla bla"},{ userId: 3, data: "bla bla2"}], 
   key: "others", 
   value: [{ userId: 2, data: "bla bla"}, { userId: 1, data: "bla bla"}, { userId: 1, data: "bla bla2"}]
}

Answer 1

grouping:by:在這里仍然可以提供幫助！ 關鍵是"me"或"others"

let dict = Dictionary(grouping: myData, by: {$0.userId == 3 ? "me" : "others"})