def string_contains_operation(haystack: StringVar[Any], needle: StringVar[Any] | str):
    """Check if a string contains another string.

    Args:
        haystack: The haystack.
        needle: The needle.

    Returns:
        The string contains operation.
    """
    return var_operation_return(
        js_expression=f"{haystack}.includes({needle})", var_type=bool
    )
Check if a string contains another string.

    Args:
        haystack: The haystack.
        needle: The needle.

    Returns:
        The string contains operation.
    
reflex/vars/sequence.py