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Improved slice documentation #127668

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Jul 13, 2024
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Improved slice documentation #127668

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60 changes: 50 additions & 10 deletions library/core/src/slice/iter.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -388,6 +388,9 @@ pub(super) trait SplitIter: DoubleEndedIterator {
/// ```
/// let slice = [10, 40, 33, 20];
/// let mut iter = slice.split(|num| num % 3 == 0);
/// assert_eq!(iter.next(), Some(&[10, 40][..]));
/// assert_eq!(iter.next(), Some(&[20][..]));
/// assert_eq!(iter.next(), None);
/// ```
///
/// [`split`]: slice::split
Expand Down Expand Up @@ -541,6 +544,9 @@ impl<T, P> FusedIterator for Split<'_, T, P> where P: FnMut(&T) -> bool {}
/// ```
/// let slice = [10, 40, 33, 20];
/// let mut iter = slice.split_inclusive(|num| num % 3 == 0);
/// assert_eq!(iter.next(), Some(&[10, 40, 33][..]));
/// assert_eq!(iter.next(), Some(&[20][..]));
/// assert_eq!(iter.next(), None);
/// ```
///
/// [`split_inclusive`]: slice::split_inclusive
Expand Down Expand Up @@ -914,7 +920,10 @@ impl<T, P> FusedIterator for SplitInclusiveMut<'_, T, P> where P: FnMut(&T) -> b
///
/// ```
/// let slice = [11, 22, 33, 0, 44, 55];
/// let iter = slice.rsplit(|num| *num == 0);
/// let mut iter = slice.rsplit(|num| *num == 0);
/// assert_eq!(iter.next(), Some(&[44, 55][..]));
/// assert_eq!(iter.next(), Some(&[11, 22, 33][..]));
/// assert_eq!(iter.next(), None);
/// ```
///
/// [`rsplit`]: slice::rsplit
Expand Down Expand Up @@ -1134,7 +1143,10 @@ impl<T, I: SplitIter<Item = T>> Iterator for GenericSplitN<I> {
///
/// ```
/// let slice = [10, 40, 30, 20, 60, 50];
/// let iter = slice.splitn(2, |num| *num % 3 == 0);
/// let mut iter = slice.splitn(2, |num| *num % 3 == 0);
/// assert_eq!(iter.next(), Some(&[10, 40][..]));
/// assert_eq!(iter.next(), Some(&[20, 60, 50][..]));
/// assert_eq!(iter.next(), None);
/// ```
///
/// [`splitn`]: slice::splitn
Expand Down Expand Up @@ -1175,7 +1187,10 @@ where
///
/// ```
/// let slice = [10, 40, 30, 20, 60, 50];
/// let iter = slice.rsplitn(2, |num| *num % 3 == 0);
/// let mut iter = slice.rsplitn(2, |num| *num % 3 == 0);
/// assert_eq!(iter.next(), Some(&[50][..]));
/// assert_eq!(iter.next(), Some(&[10, 40, 30, 20][..]));
/// assert_eq!(iter.next(), None);
/// ```
///
/// [`rsplitn`]: slice::rsplitn
Expand Down Expand Up @@ -1300,7 +1315,11 @@ forward_iterator! { RSplitNMut: T, &'a mut [T] }
///
/// ```
/// let slice = ['r', 'u', 's', 't'];
/// let iter = slice.windows(2);
/// let mut iter = slice.windows(2);
/// assert_eq!(iter.next(), Some(&['r', 'u'][..]));
/// assert_eq!(iter.next(), Some(&['u', 's'][..]));
/// assert_eq!(iter.next(), Some(&['s', 't'][..]));
/// assert_eq!(iter.next(), None);
/// ```
///
/// [`windows`]: slice::windows
Expand Down Expand Up @@ -1448,7 +1467,11 @@ unsafe impl<'a, T> TrustedRandomAccessNoCoerce for Windows<'a, T> {
///
/// ```
/// let slice = ['l', 'o', 'r', 'e', 'm'];
/// let iter = slice.chunks(2);
/// let mut iter = slice.chunks(2);
/// assert_eq!(iter.next(), Some(&['l', 'o'][..]));
/// assert_eq!(iter.next(), Some(&['r', 'e'][..]));
/// assert_eq!(iter.next(), Some(&['m'][..]));
/// assert_eq!(iter.next(), None);
/// ```
///
/// [`chunks`]: slice::chunks
Expand Down Expand Up @@ -1819,7 +1842,10 @@ unsafe impl<T> Sync for ChunksMut<'_, T> where T: Sync {}
///
/// ```
/// let slice = ['l', 'o', 'r', 'e', 'm'];
/// let iter = slice.chunks_exact(2);
/// let mut iter = slice.chunks_exact(2);
/// assert_eq!(iter.next(), Some(&['l', 'o'][..]));
/// assert_eq!(iter.next(), Some(&['r', 'e'][..]));
/// assert_eq!(iter.next(), None);
/// ```
///
/// [`chunks_exact`]: slice::chunks_exact
Expand Down Expand Up @@ -2163,7 +2189,11 @@ unsafe impl<T> Sync for ChunksExactMut<'_, T> where T: Sync {}
/// #![feature(array_windows)]
///
/// let slice = [0, 1, 2, 3];
/// let iter = slice.array_windows::<2>();
/// let mut iter = slice.array_windows::<2>();
/// assert_eq!(iter.next(), Some(&[0, 1]));
/// assert_eq!(iter.next(), Some(&[1, 2]));
/// assert_eq!(iter.next(), Some(&[2, 3]));
/// assert_eq!(iter.next(), None);
/// ```
///
/// [`array_windows`]: slice::array_windows
Expand Down Expand Up @@ -2285,7 +2315,10 @@ impl<T, const N: usize> ExactSizeIterator for ArrayWindows<'_, T, N> {
/// #![feature(array_chunks)]
///
/// let slice = ['l', 'o', 'r', 'e', 'm'];
/// let iter = slice.array_chunks::<2>();
/// let mut iter = slice.array_chunks::<2>();
/// assert_eq!(iter.next(), Some(&['l', 'o']));
/// assert_eq!(iter.next(), Some(&['r', 'e']));
/// assert_eq!(iter.next(), None);
/// ```
///
/// [`array_chunks`]: slice::array_chunks
Expand Down Expand Up @@ -2526,7 +2559,11 @@ unsafe impl<'a, T, const N: usize> TrustedRandomAccessNoCoerce for ArrayChunksMu
///
/// ```
/// let slice = ['l', 'o', 'r', 'e', 'm'];
/// let iter = slice.rchunks(2);
/// let mut iter = slice.rchunks(2);
/// assert_eq!(iter.next(), Some(&['e', 'm'][..]));
/// assert_eq!(iter.next(), Some(&['o', 'r'][..]));
/// assert_eq!(iter.next(), Some(&['l'][..]));
/// assert_eq!(iter.next(), None);
/// ```
///
/// [`rchunks`]: slice::rchunks
Expand Down Expand Up @@ -2892,7 +2929,10 @@ unsafe impl<T> Sync for RChunksMut<'_, T> where T: Sync {}
///
/// ```
/// let slice = ['l', 'o', 'r', 'e', 'm'];
/// let iter = slice.rchunks_exact(2);
/// let mut iter = slice.rchunks_exact(2);
/// assert_eq!(iter.next(), Some(&['e', 'm'][..]));
/// assert_eq!(iter.next(), Some(&['o', 'r'][..]));
/// assert_eq!(iter.next(), None);
/// ```
///
/// [`rchunks_exact`]: slice::rchunks_exact
Expand Down
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