Kotlin - RobotSimulator Complete

kotlin/robot-simulator/src/main/kotlin/Robot.kt

@@ -0,0 +1,42 @@
+class Robot(var gridPosition: GridPosition, var orientation: Orientation) {
+    constructor(): this(GridPosition(0,0), Orientation.NORTH)
+
+    fun advance(): Unit {
+        gridPosition = when (orientation) {
+            Orientation.NORTH -> gridPosition.copy(y = gridPosition.y + 1)
+            Orientation.SOUTH -> gridPosition.copy(y = gridPosition.y - 1)
+            Orientation.EAST -> gridPosition.copy(x = gridPosition.x + 1)
+            Orientation.WEST -> gridPosition.copy(x = gridPosition.x - 1)
+        }
+    }
+
+    fun turnRight(): Unit {
+        orientation = when (orientation){
+            Orientation.NORTH -> Orientation.EAST
+            Orientation.EAST -> Orientation.SOUTH
+            Orientation.SOUTH -> Orientation.WEST
+            Orientation.WEST -> Orientation.NORTH
+        }
+    }
+
+    fun turnLeft(): Unit {
+        orientation = when (orientation){
+            Orientation.NORTH -> Orientation.WEST
+            Orientation.WEST -> Orientation.SOUTH
+            Orientation.SOUTH -> Orientation.EAST
+            Orientation.EAST -> Orientation.NORTH
+        }
+    }
+
+    fun simulate(inpString: String): Unit {
+        require(inpString.all { (it == 'R') or (it == 'L') or (it == 'A') })
+        for (i in inpString){
+            when (i.toUpperCase()){
+                'R' -> this.turnRight()
+                'L' -> this.turnLeft()
+                'A' -> this.advance()
+            }
+        }
+    }
+
+}