> Rust seems to be the only one that mostly circumvents this problem. Are there other good examples? Rust is not the first one to have an Option type; it's a c

> Rust seems to be the only one that mostly circumvents this problem. Are there other good examples? Rust is not the first one to have an Option type; it's a common feature of functional languages because they have ADTs ( https://en.wikipedia.org/wiki/Algebraic_data_type https://en.wikipedia.org/wiki/Algebraic_data_type )