Fibonacci in swift

fibonacci_series/Swift/swift_fibonacci.swift

@@ -0,0 +1,30 @@
+func fibonacci(_ number: Int, _ mem: inout [Int: Double]) -> Double {
+  if number == 1 || number == 0 {
+    return 1
+  }
+
+  if let val = mem[number] {
+    return val
+  }
+
+  let val = fibonacci(number - 1, &mem) + fibonacci(number - 2, &mem)
+  mem[number] = val
+
+  return val
+}
+
+func fibonacci(_ number: Int) -> Double {
+  var mem = [Int: Double]()
+  return fibonacci(number, &mem)
+}
+
+print("Enter a number for fibonacci sequence: ", terminator: "")
+
+if let inputStr = readLine() {
+  if let input = Int(inputStr) {
+    let result = fibonacci(input)
+    print("result: \(result)")
+  } else {
+    print("Invalid number")
+  }
+}