R: Move move() into Heading.move(Position)

TECHDEBT.md

@@ -1,28 +1,12 @@
 # TODO
-- [ ] Complexity
-  - [x] long method
-  - [ ] duplicated code
-  - 
-# Mikado
-- [ ] Clean up constants and private fields
-  - [ ] Move move() into Heading.move(Position)
-  - [x] Move turnLeft() into Heading.turnLeft()
-  - [x] Move turnRight() into Heading.turnRight()
-    - [x] Remove HEADING_* constants
-      - [x] in move() compare to heading enum
-      - [x] in turnRight() compare to heading enum
-      - [x] in turnLeft() compare to heading enum
-        - [x] state.heading in Rover.constructor to enum
-          - [x] Change heading Char in RoverState to Heading enum
-            - [x] Create Heading enum
-
-# RPP
 - [ ] Reorder Responsibilities
   - [ ] long class
   - [ ] feature envy
   - [ ] inappropriate intimacy
   - [ ] data class
   - [ ] message chain
+
+# RPP
 - [ ] Refine Abstractions
   - [ ] long parameter list
   - [ ] data clump
@@ -40,3 +24,19 @@
   - [x] bad naming
   - [x] antipattern
   - [x] scopes
+- [x] Complexity
+  - [x] long method
+  - [x] duplicated code
+  -
+# Mikado
+- [x] Clean up constants and private fields
+  - [x] Move move() into Heading.move(Position)
+  - [x] Move turnLeft() into Heading.turnLeft()
+  - [x] Move turnRight() into Heading.turnRight()
+    - [x] Remove HEADING_* constants
+      - [x] in move() compare to heading enum
+      - [x] in turnRight() compare to heading enum
+      - [x] in turnLeft() compare to heading enum
+        - [x] state.heading in Rover.constructor to enum
+          - [x] Change heading Char in RoverState to Heading enum
+            - [x] Create Heading enum

src/main/kotlin/org/example/Heading.kt

@@ -1,10 +1,10 @@
 package org.example
 
-enum class Heading(val symbol: Char) {
-    NORTH('N'),
-    EAST('E'),
-    SOUTH('S'),
-    WEST('W'),
+enum class Heading(val symbol: Char, val deltaX: Int, val deltaY: Int) {
+    NORTH('N', 0, 1),
+    EAST('E', 1, 0),
+    SOUTH('S', 0, -1),
+    WEST('W', -1, 0),
     ;
 
     fun turnLeft(): Heading =
@@ -23,6 +23,11 @@ enum class Heading(val symbol: Char) {
             NORTH -> EAST
         }
 
+    fun move(
+        x: Int,
+        y: Int,
+    ): Pair<Int, Int> = Pair(x + deltaX, y + deltaY)
+
     override fun toString(): String = symbol.toString()
 
     companion object {

src/main/kotlin/org/example/Rover.kt

@@ -21,12 +21,9 @@ class Rover {
     }
 
     private fun move() {
-        when (state.heading) {
-            Heading.EAST -> state.positionX++
-            Heading.SOUTH -> state.positionY--
-            Heading.WEST -> state.positionX--
-            Heading.NORTH -> state.positionY++
-        }
+        val (updatedX, updatedY) = state.heading.move(state.positionX, state.positionY)
+        state.positionX = updatedX
+        state.positionY = updatedY
     }
 
     private fun turnRight() {