import * as optionals from "https://deno.land/x/optionals@v2.0.1/mod.ts"; ClassescOptionA Rust-like Option class. cResultA Rust-like Result class. VariablesvnoneThe primitive None value. FunctionsfErrReturn a error result. fNoneConstruct the None variant of Option. fOkReturn a non-error value result. fSomeConstruct an Option from a value other than None.