Getornone

Getornone is a term used in programming to describe a retrieval operation that returns either a value or None when a value is not available. It is not a single standardized function but a pattern manifested in various languages and libraries through a method name like get_or_none, or through idioms that yield None when no result exists. The name itself is a concatenation of "get" and "none," signaling the possibility of an absent result.

Usage of the get-or-none pattern is common when querying data structures or data stores where a requested item may not be present. In Python, for example, a dictionary’s get method returns None if the key is missing. Some object-relational mapping libraries provide a dedicated get_or_none method to fetch a record by key and return None if no match is found. The concept emphasizes explicit handling of a not-found condition without raising an exception.

Design considerations include the advantages of reducing exception handling boilerplate and making control flow simpler in some cases. However, using None to signal absence can be ambiguous if None is a valid value, so developers may use type hints to indicate Optional[T] or employ sentinel values to disambiguate. In languages with optional or maybe types, get-or-none patterns often map to those constructs (for example, Optional[T] in Python, Maybe in Haskell, or Option in Rust).

See also: dict.get, Optional type, Maybe/Option types, get with default, error handling patterns.