How to find duplicate values in integer array in Swift?

Question

I need to know how to find duplicate values in integer array by loop method in swift? I tried to ->

func findDuplicates (array: [Int]) {
        var prevItem = array[0]
        for i in 0...array.count-1 {
            if prevItem == array[i] {
                print(i)
            } else {
               print("there is no any duplicates values")
            }
        }
}

please show my solution in this way!

Answer 1

let list = [5,7,1,1,7,9]

var result : [Int] = []
var duplicateArr : [Int] = []

for i in 0..<list.count {
    var isDuplicate = false
    if duplicateArr.count == 0 {
        duplicateArr.append(list[i])
    }else{
        print(list[i])
         for j in 0..<duplicateArr.count{
             if duplicateArr[j] == list[i] {
                 isDuplicate = true
             }
         }
        if isDuplicate {
            result.append(list[i])
        }else{
            duplicateArr.append(list[i])
        }
    }
}
print("Duplicate list -> \(result))