string slice

src/ytdl_sub/script/functions/string_functions.py

@@ -16,6 +16,15 @@ class StringFunctions:
         """
         return String(value=str(value.value))
 
+    @staticmethod
+    def slice(string: String, start: Integer, end: Optional[Integer] = None) -> String:
+        """
+        Returns the slice of the Array.
+        """
+        if end is not None:
+            return String(string.value[start.value : end.value])
+        return String(string.value[start.value :])
+
     @staticmethod
     def lower(string: String) -> String:
         """

tests/unit/script/functions/test_string_functions.py

@@ -98,3 +98,14 @@ class TestNumericFunctions:
     def test_pad_zero(self, values: str, expected_output: str):
         output = single_variable_output(f"{{%pad_zero({values})}}")
         assert output == expected_output
+
+    @pytest.mark.parametrize(
+        "values, expected_output",
+        [
+            ("'2012', 2", "12"),
+            ("'2012', 1, 3", "01"),
+        ],
+    )
+    def test_slice(self, values, expected_output):
+        output = single_variable_output(f"{{%slice({values})}}")
+        assert output == expected_output