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More practical examples for Option::and_then & Result::and_then #93851

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Merged
bors merged 8 commits into from
Feb 13, 2022
Merged

More practical examples for Option::and_then & Result::and_then #93851

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a8e9708
More practical examples for `Option::and_then`
cyqsimon Feb 10, 2022
73a5f01
Use 0-based idx for array content
cyqsimon Feb 10, 2022
bd421e2
More practical examples for `Result::and_then`
cyqsimon Feb 10, 2022
942eaa7
Add negative example for `Result::and_then`
cyqsimon Feb 11, 2022
7eaecc6
`Result::and_then`: improve basic example
cyqsimon Feb 12, 2022
adfac00
`Result::and_then`: show type conversion
cyqsimon Feb 12, 2022
160faf1
`Option::and_then` basic example: show failure
cyqsimon Feb 12, 2022
f6f93fd
Add note on Windows path behaviour
cyqsimon Feb 12, 2022
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Use 0-based idx for array content
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@cyqsimon
cyqsimon committed Feb 10, 2022
commit 73a5f01263ffb80d113a9afe7004d940eebb0114
4 changes: 2 additions & 2 deletions library/core/src/option.rs
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Expand Up @@ -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);
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