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Update option_result.md #1864

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Jul 11, 2024
Merged

Update option_result.md #1864

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5 changes: 2 additions & 3 deletions src/error/multiple_error_types/option_result.md
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Original file line number Diff line number Diff line change
Expand Up @@ -28,8 +28,7 @@ fn main() {
```

There are times when we'll want to stop processing on errors (like with
[`?`][enter_question_mark]) but keep going when the `Option` is `None`. A
couple of combinators come in handy to swap the `Result` and `Option`.
[`?`][enter_question_mark]) but keep going when the `Option` is `None`. The `transpose` function comes in handy to swap the `Result` and `Option`.

```rust,editable
use std::num::ParseIntError;
Expand All @@ -39,7 +38,7 @@ fn double_first(vec: Vec<&str>) -> Result<Option<i32>, ParseIntError> {
first.parse::<i32>().map(|n| 2 * n)
});

opt.map_or(Ok(None), |r| r.map(Some))
opt.transpose()
}

fn main() {
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