My Swift 3 Measure Execution time function using GCD

Measure.swift

func measureBlock(_ description: String, numberOfExecutes: Int = 1, block: () -> Void) {
    let start = DispatchTime.now()
    for _ in 0..<numberOfExecutes {
        block()
    }
    let end = DispatchTime.now()

    let nanoTime = end.uptimeNanoseconds - start.uptimeNanoseconds
    let secondsTime = (Double(nanoTime)/1000000000.0)

    let avgNanoTime = nanoTime / UInt64(numberOfExecutes)
    let avgSecTime = secondsTime / Double(numberOfExecutes)
    print("\(description):")
    print("  Total Time was \(nanoTime)ns (\(secondsTime))s")
    print("  Took average of \(avgNanoTime)ns (\(avgSecTime)s) per block.")
    print("  Ran block \(numberOfExecutes) time(s)")
}