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Use 0-based idx for array content

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cyqsimon 2022-02-10 16:32:53 +08:00
parent a8e9708aeb
commit 73a5f01263
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1 changed files with 2 additions and 2 deletions
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4
library/core/src/option.rs
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@ -1216,10 +1216,10 @@ impl<T> Option<T> {
/// Often used to chain fallible operations that may return [`None`].
///
/// ```
/// let arr_2d = [["A1", "A2"], ["B1", "B2"]];
/// let arr_2d = [["A0", "A1"], ["B0", "B1"]];
///
/// let item_0_1 = arr_2d.get(0).and_then(|row| row.get(1));
/// assert_eq!(item_0_1, Some(&"A2"));
/// assert_eq!(item_0_1, Some(&"A1"));
///
/// let item_2_0 = arr_2d.get(2).and_then(|row| row.get(0));
/// assert_eq!(item_2_0, None);