Clean Code with Kotlin by Magda Miu - Functions 1 - Unclean Code

UncleanFunctions1.kt

fun parseProduct(response: Response?): Product? {
    if (response == null) {
        throw ClientException("Response is null")
    }
    val code: Int = response.code()
    if (code == 200 || code == 201) {
        return mapToDTO(response.body())
    }
    if (code >= 400 && code <= 499) {
        throw ClientException("Invalid request")
    }
    if (code >= 500 && code <= 599) {
        throw ClientException("Server error")
    }
    throw ClientException("Error $code")
}