R: Heading turnLeft()

TECHDEBT.md

@@ -6,7 +6,7 @@
 # Mikado
 - [ ] Clean up constants and private fields
   - [ ] Move move() into Heading.move(Position)
-  - [ ] Move turnLeft() into Heading.turnLeft()
+  - [x] Move turnLeft() into Heading.turnLeft()
   - [x] Move turnRight() into Heading.turnRight()
     - [x] Remove HEADING_* constants
       - [x] in move() compare to heading enum

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

@@ -7,6 +7,13 @@ enum class Heading(val symbol: Char) {
     WEST('W'),
     ;
 
+    fun turnLeft() = when (this) {
+        EAST -> NORTH
+        NORTH -> WEST
+        WEST -> SOUTH
+        SOUTH -> EAST
+    }
+
     fun turnRight() = when (this) {
         EAST -> SOUTH
         SOUTH -> WEST

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

@@ -34,12 +34,7 @@ class Rover {
     }
 
     private fun turnLeft() {
-        when (state.heading) {
+        state.heading = state.heading.turnLeft()
-            Heading.EAST -> state.heading = Heading.NORTH
-            Heading.NORTH -> state.heading = Heading.WEST
-            Heading.WEST -> state.heading = Heading.SOUTH
-            Heading.SOUTH -> state.heading = Heading.EAST
-        }
     }
 
     val position: String