Simple Filter

simple-filter.swift

var filterCache: [CGFloat] = []
func filter(_ value: CGFloat, for seconds: CGFloat) -> CGFloat {
    filterCache.append(value)
    guard filterCache.count > 1 else { return value }
    let frameCount = Int(seconds * CGFloat(UIScreen.main.maximumFramesPerSecond))
    if filterCache.count > frameCount {
       filterCache.remove(at: 0)
    }
    var filtered: CGFloat = 0.0
    for val in filterCache {
        filtered += val
    }
    filtered /= CGFloat(filterCache.count)
    return filtered
}