A number that appears only once in an array

subject ： A number that appears only once
explain ： Given an array of non-empty integers , Except that an element only appears once , Each of the other elements occurs twice . Find the element that only appears once .

• Swift

    /*  subject ： A number that appears only once   explain ： Given an array of non-empty integers , Except that an element only appears once , Each of the other elements occurs twice . Find the element that only appears once . */
    
    func singleNums(_ nums: [Int]) -> Int {
    
        
        for i in 0..<nums.count {
    
            
            var sigle: Bool = true

            for j in 0..<nums.count {
    
                
                if (j != i && nums[i] == nums[j]) {
    
                    sigle = false
                    break
                }
            }
            
            if (sigle) {
    
                return nums[i]
            }
        }
        return 0
    }