impure
adj. C1 Advanced US //ˌɪmˈpjʊɹ// UK //ɪmpjˈɔː// im·pure
adj. containing something bad or unwanted. In programming, it means a value or data that is not in the correct format or is missing.
adj. containing an undesirable or incorrect component. In a programming context, it describes a value that fails to meet a specific type or validation constraint.
The function returns an impure value if the input is wrong.
The system checks for impure data before it processes the transaction to prevent errors.
In functional programming, an impure function is one that produces different results for the same input or has side effects that alter the program's state.
From Middle French impur, from Latin impūrus.