feat: Add reverse_string_builtin()

Author: yyossy5

src/basic/string.py

@@ -20,6 +20,27 @@ def reverse_string(text: str) -> str:
     return text[::-1]
 
 
+def reverse_string_builtin(text: str) -> str:
+    """
+    Returns the reversed string using Python's built-in reversed() function
+
+    Args:
+        text (str): The string to be reversed
+
+    Returns:
+        str: The reversed string
+
+    Examples:
+        >>> reverse_string_builtin("hello")
+        'olleh'
+    """
+    # reversed(sequence): creates an iterator that yields elements in reverse order
+    #                    (works with sequences like str, list, tuple, but not with unordered iterables like set)
+    # "".join(): concatenates iterator elements into a single string using empty string as separator
+    # example: "hello" -> iterator('o','l','l','e','h') -> "olleh"
+    return "".join(reversed(text))
+
+
 def extract_alphanumeric(s: str) -> str:
     """
     Extracts only alphanumeric characters from the given string

test/basic/test_string.py

@@ -4,7 +4,11 @@
 
 import unittest
 
-from src.basic.string import extract_alphanumeric, reverse_string
+from src.basic.string import (
+    extract_alphanumeric,
+    reverse_string,
+    reverse_string_builtin,
+)
 
 
 class TestString(unittest.TestCase):
@@ -31,6 +35,27 @@ def test_reverse_string_with_spaces(self):
         """Test for string with spaces"""
         self.assertEqual(reverse_string("hello world"), "dlrow olleh")
 
+    def test_reverse_string_builtin_basic(self):
+        """Test for basic string reversal using built-in function"""
+        self.assertEqual(reverse_string_builtin("hello"), "olleh")
+        self.assertEqual(reverse_string_builtin("python"), "nohtyp")
+
+    def test_reverse_string_builtin_empty(self):
+        """Test for empty string using built-in function"""
+        self.assertEqual(reverse_string_builtin(""), "")
+
+    def test_reverse_string_builtin_single_char(self):
+        """Test for single character string using built-in function"""
+        self.assertEqual(reverse_string_builtin("a"), "a")
+
+    def test_reverse_string_builtin_japanese(self):
+        """Test for Japanese string using built-in function"""
+        self.assertEqual(reverse_string_builtin("こんにちは"), "はちにんこ")
+
+    def test_reverse_string_builtin_with_spaces(self):
+        """Test for string with spaces using built-in function"""
+        self.assertEqual(reverse_string_builtin("hello world"), "dlrow olleh")
+
     def test_extract_alphanumeric_basic(self):
         """Test for basic alphanumeric extraction"""
         self.assertEqual(extract_alphanumeric("Hello123"), "Hello123")