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Rollup merge of #102435 - GuillaumeGomez:improve-iterator-reduce-example, r=thomcc,vacuus

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Improve example of Iterator::reduce

Fixes #81819.

I took your example `@bstrie` from https://github.com/rust-lang/rust/issues/81819 and applied it here.

r? `@thomcc`
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Dylan DPC 2022-09-29 18:13:20 +05:30 committed by GitHub
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1 changed files with 5 additions and 14 deletions
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19
library/core/src/iter/traits/iterator.rs
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@ -2431,22 +2431,13 @@ pub trait Iterator {
///
/// # Example
///
/// Find the maximum value:
///
/// ```
/// fn find_max<I>(iter: I) -> Option<I::Item>
/// where I: Iterator,
/// I::Item: Ord,
/// {
/// iter.reduce(|accum, item| {
/// if accum >= item { accum } else { item }
/// })
/// }
/// let a = [10, 20, 5, -23, 0];
/// let b: [u32; 0] = [];
/// let reduced: i32 = (1..10).reduce(|acc, e| acc + e).unwrap();
/// assert_eq!(reduced, 45);
///
/// assert_eq!(find_max(a.iter()), Some(&20));
/// assert_eq!(find_max(b.iter()), None);
/// // Which is equivalent to doing it with `fold`:
/// let folded: i32 = (1..10).fold(0, |acc, e| acc + e);
/// assert_eq!(reduced, folded);
/// ```
#[inline]
#[stable(feature = "iterator_fold_self", since = "1.51.0")]