如何从数组中获取公共元素并创建新的数组集？

Question

让arrayA = [“橙色”，“苹果”，“葡萄”，“橙色”，“苹果”，“苹果”]

预期结果将是这样：

   let arrSet1 = ["Orange", "Orange"]
   let arrSet2 = ["Apple", "Apple", "Apple"]
   let arrSet3 = ["grapes"]

Answer 1

使用Dictionary's init(grouping:by:)，

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