Result
implements FromIterator
, so you can move the Result
outside and iterators will take care of the rest (including stopping iteration if an error is found).
#[derive(Debug)]
struct Item;
type Id = String;
fn find(id: &Id) -> Result<Item, String> {
Err(format!("Not found: {:?}", id))
}
fn main() {
let s = |s: &str| s.to_string();
let ids = vec![s("1"), s("2"), s("3")];
let items: Result<Vec<_>, _> = ids.iter().map(find).collect();
println!("Result: {:?}", items);
}