More Efficient, do not recreate the result Array

MergeSortV2.swift

func mergeSort(var values:[Int])->[Int]{
    
    if(values.count <= 1){
        return values;
    }
    
    if(values.count == 2){
        if(values[0] > values[1]){
            swap(&values[0],&values[1])
        }
        return values
    }
    
    let mid = Int(values.count / 2)
    var leftArr = mergeSort(Array(values[0...mid-1]))
    var rightArr = mergeSort(Array(values[mid...values.count-1]))
    
    var result:[Int] = []
    let size = leftArr.count + rightArr.count
    var i = 0
    var j = 0

    for(var k=0;i<size;k += 1){
        
        if i >= leftArr.count{
            result.appendContentsOf(Array(rightArr[j...rightArr.count-1]))
            break
        }
        
        if j >= rightArr.count{
            result.appendContentsOf(Array(leftArr[i...leftArr.count-1]))
            break
        }
        
        if rightArr[j] <= leftArr[i]{
            result.append(rightArr[j])
            j += 1
            continue
        }
        
        result.append(leftArr[i])
        i += 1
    }
    
    return result;
    
}


print(mergeSort([2,0,4,6,5,3]))