Array Extensions

ascendingSLASHdiscendingSort(key:String)

extension NSArray{
 //sorting- ascending
  func ascendingArrayWithKeyValue(key:String) -> NSArray{
    let ns = NSSortDescriptor.init(key: key, ascending: true)
    let aa = NSArray(object: ns)
    let arrResult = self.sortedArray(using: aa as! [NSSortDescriptor])
    return arrResult as NSArray
  }

  //sorting - descending
  func discendingArrayWithKeyValue(key:String) -> NSArray{
    let ns = NSSortDescriptor.init(key: key, ascending: false)
    let aa = NSArray(object: ns)
    let arrResult = self.sortedArray(using: aa as! [NSSortDescriptor])
    return arrResult as NSArray
  }
}

DOTremoveDuplicates

extension Array where Element:Equatable {
    func removeDuplicates() -> [Element] {
        var result = [Element]()
        
        for value in self {
            if result.contains(value) == false {
                result.append(value)
            }
        }
        
        return result
    }
}