rust - How to use a map over vectors? - Stack Overflow
Rust likes to be more general than that; mapping is done over iterators, rather than over solely vectors or slices. A couple of demonstrations:
rust - error handling, map_err and error type conversion - Stack …
Jan 2, 2022 · 8 map_err is returning a Result<i64, ParsePosNonzeroError> but you're trying to affect it to x, which you declared as an i64 variable. You need to add a ? so that an Err result …
rust - Why does Result::map_err behave differently when using ? or ...
Feb 15, 2024 · Why does Result::map_err behave differently when using ? or return Asked 1 year, 10 months ago Modified 1 year, 10 months ago Viewed 4k times
rust - How do I stop iteration and return an error when …
7 Handling nested .map() closure Result 's What if we have a .map() within a .map() within a .map()? Here's an example for the specific case where the .map() operations are nested. The …
In Rust `map_or` and `map_or_else` method of `Option`/`Result`, …
Sep 20, 2022 · map_or takes a value, this means the "or" has to be evaluated before the method is even called, that is in a.map_or(b, fn) Rust has to first fully evaluate a and b before it can …
rust - How to map over only the Some () values in an iterator?
Oct 1, 2020 · If your mapping is already returning an Option and you want to skip over Nones, then filter_map is much, much nicer to use. doc.rust-lang.org But it doesn't unwrap the value in …
rust - What is the idiomatic way to do something when an Option …
Jan 26, 2022 · As Lukas suggested, the map_or method can also be used. Note that arguments passed to map_or are eagerly evaluated, so if performance is critical, you might want to …
rust - How to do proper error handling inside a map function?
Dec 2, 2021 · How to do proper error handling inside a map function? [duplicate] Asked 4 years, 1 month ago Modified 4 years ago Viewed 5k times
Understanding filter_map in rust - Stack Overflow
Jun 12, 2020 · I am trying to get ages of all Person who has some second name. I was able to do it using filter and map separately as below, But I am wondering if we can use filter_map in rust. …
rust - How to use ? operator in Option's .map () method ... - Stack ...
Oct 24, 2023 · the `?` operator can only be used in a closure that returns `Result` or `Option` (or another type that implements `FromResidual`) I would like to use it like: