Initial data commit

Task/Sorting-algorithms-Merge-sort/Io/sorting-algorithms-merge-sort.io

@@ -0,0 +1,28 @@
+List do (
+    merge := method(lst1, lst2,
+        result := list()
+        while(lst1 isNotEmpty or lst2 isNotEmpty,
+            if(lst1 first <= lst2 first) then(
+                result append(lst1 removeFirst)
+            ) else (
+                result append(lst2 removeFirst)
+            )
+        )
+    result)
+
+    mergeSort := method(
+        if (size > 1) then(
+            half_size := (size / 2) ceil
+            return merge(slice(0, half_size) mergeSort,
+                         slice(half_size, size) mergeSort)
+        ) else (return self)
+    )
+
+    mergeSortInPlace := method(
+        copy(mergeSort)
+    )
+)
+
+lst := list(9, 5, 3, -1, 15, -2)
+lst mergeSort println # ==> list(-2, -1, 3, 5, 9, 15)
+lst mergeSortInPlace println # ==> list(-2, -1, 3, 5, 9, 15)