From 737fc65f7677618eae678ebacd635b65b540295f Mon Sep 17 00:00:00 2001
From: Colum O'Donovan <colum.odonovan@simplybusiness.co.uk>
Date: Fri, 10 Nov 2023 16:05:52 +0000
Subject: [PATCH] Refactor turn left to remove case/when

---
 lib/mars_rover.rb | 20 ++++++++------------
 1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/lib/mars_rover.rb b/lib/mars_rover.rb
index 3888395..005675a 100644
--- a/lib/mars_rover.rb
+++ b/lib/mars_rover.rb
@@ -5,6 +5,13 @@
 class MarsRover
   attr_reader :point
 
+  LEFT_LOOKUP = {
+    'E' => 'N',
+    'S' => 'E',
+    'W' => 'S',
+    'N' => 'W'
+  }
+
   def initialize(point)
     @point = point
   end
@@ -55,18 +62,7 @@ def move_backward
   end
 
   def turn_left
-    case point.direction
-    when 'E'
-      new_direction = 'N'
-    when 'S'
-      new_direction = 'E'
-    when 'W'
-      new_direction = 'S'
-    when 'N'
-      new_direction = 'W'
-    end
-
-    @point = Point.new(@point.x, @point.y, new_direction)
+    @point = Point.new(@point.x, @point.y, LEFT_LOOKUP[point.direction])
   end