如何从数组中获取公共元素并创建新的数组集？

Question

 let arrayA = ["Orange", "Apple", "grapes", "Orange", "Apple","Apple"]

预期结果将是这样的：

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

Answer 1

使用Dictionary's init(grouping:by:),

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

现在，从arrays创建其他 arrSet1 和其他人像这样，

let arrSet1 = arrays[0]
let arrSet2 = arrays[1]
let arrSet3 = arrays[2]

确保您访问arrays基于计数，否则它可能会抛出索引越界异常。