TCA NOOP Action round trip

Snippet.swift

/// Add a noop action into your main reducer, don't do anything in that action, just return .none        
/// __run the app in RELEASE to get all optimizations enabled __
/// Add this code at the end of your app finish launching delegate call (or onAppear on main view if not using delegate)

// The Interquartile Range (IQR) method is a robust technique used in statistics to measure the spread of data and identify outliers. It is less sensitive to extreme values compared to other methods like standard deviation
func removeOutliers(from array: [Double]) -> [Double] {
    func quartiles(of array: [Double]) -> (Double, Double) {
        let sortedArray = array.sorted()
        let count = sortedArray.count

        let q1 = median(of: Array(sortedArray[0 ..< (count / 2)]))
        let q3 = median(of: Array(sortedArray[((count + 1) / 2)...]))

        return (q1, q3)
    }

    func interquartileRange(of array: [Double]) -> Double {
        let (q1, q3) = quartiles(of: array)
        return q3 - q1
    }

    let (q1, q3) = quartiles(of: array)
    let iqr = q3 - q1
    let lowerBound = q1 - 1.5 * iqr
    let upperBound = q3 + 1.5 * iqr

    return array.filter { $0 >= lowerBound && $0 <= upperBound }
}

// Keep track of the measurements
var measurements = [Double]()

// Create a timer that fires every second
let timer = Timer.scheduledTimer(withTimeInterval: measurementTicker, repeats: true) { _ in
    let start = CFAbsoluteTimeGetCurrent()
    self.viewStore.send(.noop)
    let end = CFAbsoluteTimeGetCurrent()

    let roundtripTime = (end - start) * 1000
    measurements.append(roundtripTime)

    // Check if the measurement interval has elapsed
    if measurements.count == Int(measurementInterval / measurementTicker) {
        let filteredMeasurements = removeOutliers(from: measurements)
        let averageRoundtripTime = measurements.reduce(0, +) / Double(measurements.count)
        print("ROUNDTRIP(\(measurementInterval)s): \(averageRoundtripTime) ms, stddev: \(standardDeviation(of: measurements)) ms, median \(median(of: measurements)) ms")

        // Reset the measurements for the next interval
        measurements.removeAll()
    }
}

// Start the timer after 30s delay
timer.fireDate = Date(timeIntervalSinceNow: 30)
timer.fire()