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Replace binary_search example with try_into (#1213)

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I don't think `binary_search` is the best example of using `Result` — it
should actually use an `Either` type instead.
This commit is contained in:
Martin Geisler 2023-09-20 15:52:10 +02:00 committed by GitHub
parent 38557b142a
commit ddc9ea1fa6
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1 changed files with 5 additions and 5 deletions
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10
src/std/option-result.md
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@ -8,8 +8,8 @@ fn main() {
let first: Option<&i8> = numbers.first();
println!("first: {first:?}");
let idx: Result<usize, usize> = numbers.binary_search(&10);
println!("idx: {idx:?}");
let arr: Result<[i8; 3], Vec<i8>> = numbers.try_into();
println!("arr: {arr:?}");
}
```
@ -18,8 +18,8 @@ fn main() {
* `Option` and `Result` are widely used not just in the standard library.
* `Option<&T>` has zero space overhead compared to `&T`.
* `Result` is the standard type to implement error handling as we will see on Day 3.
* `binary_search` returns `Result<usize, usize>`.
* If found, `Result::Ok` holds the index where the element is found.
* Otherwise, `Result::Err` contains the index where such an element should be inserted.
* `try_into` attempts to convert the vector into a fixed-sized array. This can fail:
* If the vector has the right size, `Result::Ok` is returned with the array.
* Otherwise, `Result::Err` is returned with the original vector.
</details>