Sort an array of 0s, 1s and 2s || Dutch National Flag solution

[Question]: How to sort an array which has 0s, 1s and 2s

Approach #1 Using Dutch National Flag

I used three pointers low mid & high The sorting of 0,1,2 is as per below steps
arr[0….low-1] contains 0. [most left part]
arr[low….mid-1] contains 1
arr[high+1….n-1] contains 2. [most right part],
So we swap according to the left(0) mid(1) & hight(2) position

func sortZerosOnesTwos(nums: inout [Int]) {
    var low = 0
    var high = nums.count - 1
    var mid = 0
    
    while mid <= high {
        let item = nums[mid]
        switch item {
            case 0:
                nums.swapAt(low,mid)
                low += 1
                mid += 1
            case 2:
                nums.swapAt(mid,high)
                high -= 1
            case 1:
                mid += 1
            default:
                continue
        }
    }
}
var miscArray = [0,2,0,2,1,1]
sortZerosOnesTwos(nums: &miscArray)
print("After sorting 0's, 1's, 2's", miscArray) //[0, 0, 1, 1, 2, 2]