在swift 3中将数组对象拆分为数组组

Question

我有一个如下所示的数组：

let totalArr = ["First","Second","Third","Fourth","First","Second", "Second"]

我所需的输出是：

let grouper = [["First","First"],["Second", "Second", "Second"],["Third"],  ["Fourth"]]

有人可以给出最佳迭代吗？

Answer 1

 let totalArr = ["First","Second","Third","Fourth","First","Second", "Second"]

 let grouper =   (Dictionary(grouping: totalArr, by: { $0})).map {  $0.value}

 print(grouper)

或者

  let arranged =   (Dictionary(grouping: totalArr, by: { $0})).values
 print(arranged)