// [Read its documentation here.](https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.map)
// Which functions in previous parts can you rewrite to use `map` instead?
// (Hint: read the source code of `map`, and see if the pattern appears in your own code.)
// [Read its documentation here.](https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.map)
// Which functions in previous parts can you rewrite to use `map` instead?
// (Hint: read the source code of `map`, and see if the pattern appears in your own code.)