I found there was not much swift solution for popular questions. I want share some of my swift solutions if some one is interested in it. If you like to see more solutions in Swift. Please let me know.

```
class Solution {
func fourSum(_ nums: [Int], _ target: Int) -> [[Int]] {
let sorted = nums.sorted()
var res = Array<[Int]>()
if nums.count < 4{
return res
}
for i in 0...sorted.count-4{
//cutting branch
if i>0 && sorted[i]==sorted[i-1]{continue}
for j in i+1...sorted.count-3{
//cutting branch
if j>i+1 && sorted[j]==sorted[j-1]{continue}
var left = j+1
var right = sorted.count-1
while left < right{
let sum = sorted[i]+sorted[j]+sorted[left]+sorted[right]
if sum == target{
res.append([sorted[i],sorted[j],sorted[left],sorted[right]])
right -= 1;
left += 1;
while sorted[right] == sorted[right+1] && left < right
{ right -= 1 ;}
while sorted[left] == sorted[left-1] && left < right
{ left += 1 ;}
}
else if sum > target {
right -= 1
}
else {
left += 1
}
}
}
}
return res
}
}
```