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doc: improve Option::map example #25920

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bors merged 1 commit into from
Jun 2, 2015
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doc: improve Option::map example #25920

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8 changes: 5 additions & 3 deletions src/libcore/option.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -409,9 +409,11 @@ impl<T> Option<T> {
/// Convert an `Option<String>` into an `Option<usize>`, consuming the original:
///
/// ```
/// let num_as_str: Option<String> = Some("10".to_string());
/// // `Option::map` takes self *by value*, consuming `num_as_str`
/// let num_as_int: Option<usize> = num_as_str.map(|n| n.len());
/// let maybe_some_string = Some(String::from("Hello, World!"));
/// // `Option::map` takes self *by value*, consuming `maybe_some_string`
/// let maybe_some_len = maybe_some_string.map(|s| s.len());
///
/// assert_eq!(maybe_some_len, Some(13));
/// ```
#[inline]
#[stable(feature = "rust1", since = "1.0.0")]
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