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Add result example + rewording

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Fabian Hintringer 2022-12-13 09:17:22 +01:00 committed by GitHub
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commit 083560b7d8
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1 changed files with 8 additions and 4 deletions
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12
library/core/src/iter/traits/iterator.rs
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@ -1495,12 +1495,16 @@ fn flat_map<U, F>(self, f: F) -> FlatMap<Self, U, F>
/// assert_eq!(merged, "alphabetagamma");
/// ```
///
/// Flattening also works on other types like Option and Result:
/// Flattening works on any `IntoIterator` type, including `Option` and `Result`:
///
/// ```
/// let values = vec![Some(123), Some(321), None, Some(231)];
/// let flattened_values: Vec<_> = values.into_iter().flatten().collect();
/// assert_eq!(flattened_values, vec![123, 321, 231]);
/// let options = vec![Some(123), Some(321), None, Some(231)];
/// let flattened_options: Vec<_> = options.into_iter().flatten().collect();
/// assert_eq!(flattened_options, vec![123, 321, 231]);
///
/// let results = vec![Ok(123), Ok(321), Err(456), Ok(231)];
/// let flattened_results: Vec<_> = results.into_iter().flatten().collect();
/// assert_eq!(flattened_results, vec![123, 321, 231]);
/// ```
///
/// You can also rewrite this in terms of [`flat_map()`], which is preferable