def __add__(self, other: StringVar | str) -> ConcatVarOperation:
        """Concatenate two strings.

        Args:
            other: The other string.

        Returns:
            The string concatenation operation.
        """
        if not isinstance(other, (StringVar, str)):
            raise_unsupported_operand_types("+", (type(self), type(other)))

        return ConcatVarOperation.create(self, other)
Concatenate two strings.

        Args:
            other: The other string.

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