[REFACTOR] [Hacker Rank] Interview Preparation Kit: Arrays: Left Rotation. Clean code improvement.

Author: Gonzalo Diaz

algorithm-exercises-java/src/main/java/ae/hackerrank/interview_preparation_kit/arrays/ArraysLeftRoration.java

@@ -14,12 +14,12 @@ private ArraysLeftRoration() {
    * rotLeftOne.
    */
   public static List<Integer> rotLeftOne(List<Integer> a) {
-
     // Clone the list
     List<Integer> output = new ArrayList<>(a);
+    final int FIRST_POSITION = 0;
 
-    Integer first = output.getFirst();
-    output.remove(0);
+    Integer first = output.get(FIRST_POSITION);
+    output.remove(FIRST_POSITION);
     output.add(first);
 
     return output;
@@ -37,7 +37,7 @@ public static List<Integer> rotLeft(List<Integer> a, int d) {
     while (i <= d)
     {
 
-      output = ArraysLeftRoration.rotLeftOne(output);
+      output = rotLeftOne(output);
       i += 1;
     }