Data commit

Task/Leonardo-numbers/Swift/leonardo-numbers.swift

@@ -0,0 +1,24 @@
+struct Leonardo: Sequence, IteratorProtocol {
+    private let add : Int
+    private var n0: Int
+    private var n1: Int
+
+    init(n0: Int = 1, n1: Int = 1, add: Int = 1) {
+        self.n0 = n0
+        self.n1 = n1
+        self.add = add
+    }
+
+    mutating func next() -> Int? {
+        let n = n0
+        n0 = n1
+        n1 += n + add
+        return n
+    }
+}
+
+print("First 25 Leonardo numbers:")
+print(Leonardo().prefix(25).map{String($0)}.joined(separator: " "))
+
+print("First 25 Fibonacci numbers:")
+print(Leonardo(n0: 0, add: 0).prefix(25).map{String($0)}.joined(separator: " "))