Data commit

Task/Averages-Simple-moving-average/Swift/averages-simple-moving-average.swift

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+struct SimpleMovingAverage {
+  var period: Int
+  var numbers = [Double]()
+
+  mutating func addNumber(_ n: Double) -> Double {
+    numbers.append(n)
+
+    if numbers.count > period {
+      numbers.removeFirst()
+    }
+
+    guard !numbers.isEmpty else {
+      return 0
+    }
+
+    return numbers.reduce(0, +) / Double(numbers.count)
+  }
+}
+
+for period in [3, 5] {
+  print("Moving average with period \(period)")
+
+  var averager = SimpleMovingAverage(period: period)
+
+  for n in [1.0, 2, 3, 4, 5, 5, 4, 3, 2, 1] {
+    print("n: \(n); average \(averager.addNumber(n))")
+  }
+}