Basics - Rust cheat sheetOption<T>To inner typefn unwrap () -> Tfn unwrap_or (T) -> Tfn unwrap_or_else (() -> T) -> Tfn unwrap_or_default () -> T where T: Defaultfn expect (&str) -> TConverting to another typefn map ((T) -> U) -> Option<U>fn map_or (U, (T) -> U) -> Ufn map_or_else (() -> U, (T) -> U) -> UTo Resultfn ok_or (E) -> Result<T, E>fn ok_or_else (() -> E) -> Result<T, E>Conditioningfn filter ((&T) -> bool) -> Opt
