Filter

filter.swift

var filters: [String: [CGFloat]] = [:]
func filter(_ val: CGFloat, for count: Int, as id: String) -> CGFloat {
    if var filter = filters[id] {
        filter.insert(val, at: 0)
        let lastVal: CGFloat
        if filter.count > count {
            lastVal = filter.popLast()!
        } else {
            lastVal = filter.last!
        }
        filters[nameID] = filter
        return lastVal
    } else {
        filters[id] = [val]
        return val
    }
}