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Auto merge of #102283 - GuillaumeGomez:option-code-example-unwrap-or-default, r=thomcc

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Improve code example for Option::unwrap_or_default

Fixes #100054.
Follow-up of #102259.

r? `@thomcc`
This commit is contained in:
bors 2022-09-26 23:17:52 +00:00
parent 8b705839cd 475aeab79e
commit f3a6fbf2f2
1 changed files with 4 additions and 12 deletions
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16
library/core/src/option.rs
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@ -834,20 +834,12 @@ impl<T> Option<T> {
///
/// # Examples
///
/// Converts a string to an integer, turning poorly-formed strings
/// into 0 (the default value for integers). [`parse`] converts
/// a string to any other type that implements [`FromStr`], returning
/// [`None`] on error.
///
/// ```
/// let good_year_from_input = "1909";
/// let bad_year_from_input = "190blarg";
/// // Result::ok() converts a Result<T> to an Option<T>
/// let good_year = good_year_from_input.parse().ok().unwrap_or_default();
/// let bad_year = bad_year_from_input.parse().ok().unwrap_or_default();
/// let x: Option<u32> = None;
/// let y: Option<u32> = Some(12);
///
/// assert_eq!(1909, good_year);
/// assert_eq!(0, bad_year);
/// assert_eq!(x.unwrap_or_default(), 0);
/// assert_eq!(y.unwrap_or_default(), 12);
/// ```
///
/// [default value]: Default::default