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Explain NSOPERATION Priority.

Ans : 

All operations may not be equally important. Setting the queuePriority property will promote or defer an operation in an NSOperationQueue according to the following rankings:

public enum NSOperationQueuePriority : Int {
    case VeryLow
    case Low
    case Normal
    case High
    case VeryHigh


The operations with high priority will be executed first.

let backgroundOperation = NSOperation()
backgroundOperation.queuePriority = .Low

let operationQueue = NSOperationQueue.mainQueue()

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