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Docs: Better explanation of return values for min, max functions for the Iterator trait #39955

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Feb 20, 2017
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Docs: Better explanation of return values for min, max functions for the Iterator trait #39955

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28 changes: 22 additions & 6 deletions src/libcore/iter/iterator.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1616,16 +1616,20 @@ pub trait Iterator {
/// Returns the maximum element of an iterator.
///
/// If several elements are equally maximum, the last element is
/// returned.
/// returned. If the iterator is empty, [`None`] is returned.
///
/// [`None`]: ../../std/option/enum.Option.html#variant.None
///
/// # Examples
///
/// Basic usage:
///
/// ```
/// let a = [1, 2, 3];
/// let b: Vec<u32> = Vec::new();
///
/// assert_eq!(a.iter().max(), Some(&3));
/// assert_eq!(b.iter().max(), None);
/// ```
#[inline]
#[stable(feature = "rust1", since = "1.0.0")]
Expand All @@ -1642,16 +1646,20 @@ pub trait Iterator {
/// Returns the minimum element of an iterator.
///
/// If several elements are equally minimum, the first element is
/// returned.
/// returned. If the iterator is empty, [`None`] is returned.
///
/// [`None`]: ../../std/option/enum.Option.html#variant.None
///
/// # Examples
///
/// Basic usage:
///
/// ```
/// let a = [1, 2, 3];
/// let b: Vec<u32> = Vec::new();
///
/// assert_eq!(a.iter().min(), Some(&1));
/// assert_eq!(b.iter().min(), None);
/// ```
#[inline]
#[stable(feature = "rust1", since = "1.0.0")]
Expand All @@ -1669,7 +1677,9 @@ pub trait Iterator {
/// specified function.
///
/// If several elements are equally maximum, the last element is
/// returned.
/// returned. If the iterator is empty, [`None`] is returned.
///
/// [`None`]: ../../std/option/enum.Option.html#variant.None
///
/// # Examples
///
Expand All @@ -1694,7 +1704,9 @@ pub trait Iterator {
/// specified comparison function.
///
/// If several elements are equally maximum, the last element is
/// returned.
/// returned. If the iterator is empty, [`None`] is returned.
///
/// [`None`]: ../../std/option/enum.Option.html#variant.None
///
/// # Examples
///
Expand All @@ -1719,7 +1731,9 @@ pub trait Iterator {
/// specified function.
///
/// If several elements are equally minimum, the first element is
/// returned.
/// returned. If the iterator is empty, [`None`] is returned.
///
/// [`None`]: ../../std/option/enum.Option.html#variant.None
///
/// # Examples
///
Expand All @@ -1743,7 +1757,9 @@ pub trait Iterator {
/// specified comparison function.
///
/// If several elements are equally minimum, the first element is
/// returned.
/// returned. If the iterator is empty, [`None`] is returned.
///
/// [`None`]: ../../std/option/enum.Option.html#variant.None
///
/// # Examples
///
Expand Down