Merge pull request #246 from antfitch/antfitch-patch-1

Fixed recursion error in binary_search_by_recursion

Author: harshildarji

Diff for: searches/binary_search.py

@@ -110,6 +110,9 @@ def binary_search_by_recursion(sorted_collection, item, left, right):
     >>> binary_search_std_lib([0, 5, 7, 10, 15], 6)
 
     """
+    if (right < left):
+        return None
+    
     midpoint = left + (right - left) // 2
 
     if sorted_collection[midpoint] == item: