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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:03:36 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:03:36 +0000 |
commit | 17d40c6057c88f4c432b0d7bac88e1b84cb7e67f (patch) | |
tree | 3f66c4a5918660bb8a758ab6cda5ff8ee4f6cdcd /src/tools/clippy/src/docs/bind_instead_of_map.txt | |
parent | Adding upstream version 1.64.0+dfsg1. (diff) | |
download | rustc-f7f0cc2a5d72e2c61c1f6900e70eec992bea4273.tar.xz rustc-f7f0cc2a5d72e2c61c1f6900e70eec992bea4273.zip |
Adding upstream version 1.65.0+dfsg1.upstream/1.65.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/tools/clippy/src/docs/bind_instead_of_map.txt')
-rw-r--r-- | src/tools/clippy/src/docs/bind_instead_of_map.txt | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/tools/clippy/src/docs/bind_instead_of_map.txt b/src/tools/clippy/src/docs/bind_instead_of_map.txt new file mode 100644 index 000000000..148575803 --- /dev/null +++ b/src/tools/clippy/src/docs/bind_instead_of_map.txt @@ -0,0 +1,22 @@ +### What it does +Checks for usage of `_.and_then(|x| Some(y))`, `_.and_then(|x| Ok(y))` or +`_.or_else(|x| Err(y))`. + +### Why is this bad? +Readability, this can be written more concisely as +`_.map(|x| y)` or `_.map_err(|x| y)`. + +### Example +``` +let _ = opt().and_then(|s| Some(s.len())); +let _ = res().and_then(|s| if s.len() == 42 { Ok(10) } else { Ok(20) }); +let _ = res().or_else(|s| if s.len() == 42 { Err(10) } else { Err(20) }); +``` + +The correct use would be: + +``` +let _ = opt().map(|s| s.len()); +let _ = res().map(|s| if s.len() == 42 { 10 } else { 20 }); +let _ = res().map_err(|s| if s.len() == 42 { 10 } else { 20 }); +```
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