Solución reto 46 en Swift

robot.playground/Contents.swift

@@ -0,0 +1,64 @@
+import Foundation
+
+func girar(direccion: String) ->String {
+    var d = ""
+
+    switch direccion {
+        case "N":
+            d = "O"
+        case "S":
+            d = "E"
+        case "E":
+            d = "N"
+        case "O":
+            d = "S"
+        default:
+            print("Dirección incorrecta")
+    }
+
+    return d
+}
+
+func avanzar(x: Int, y: Int, dato: Int, direccion: String) -> [Int] {
+    var xx = x
+    var yy = y
+    switch direccion {
+        case "N":
+            yy += dato
+        case "S":
+            yy -= dato
+        case "E":
+            xx += dato
+        case "O":
+            xx -= dato
+        default:
+            print("Dirección incorrecta...")
+    }
+
+    return [xx,yy]
+}
+
+func dondeEsRobot(arreglo:[Int]) -> [Int] {
+    var d =  "E"
+    var x = 0
+    var y = 0
+    var coordenadas: [Int]
+    for dato in arreglo {
+        if dato < 0 {
+            d = girar(direccion: d)
+            d = girar(direccion: d)
+            d = girar(direccion: d)
+        } else {
+            d = girar(direccion: d)
+        }
+        //print(d)
+        coordenadas = avanzar(x: x, y: y, dato: abs(dato), direccion: d)
+        x = coordenadas[0]
+        y = coordenadas[1]
+    }
+
+    return [x,y]
+}
+
+print(dondeEsRobot(arreglo: [10,5,-2]))
+print(dondeEsRobot(arreglo: [-2,3,-1,4]))

robot.playground/contents.xcplayground

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+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<playground version='5.0' target-platform='ios' buildActiveScheme='true' importAppTypes='true'>
+    <timeline fileName='timeline.xctimeline'/>
+</playground>