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Diffstat (limited to 'src/docs/bind_instead_of_map.txt')
| -rw-r--r-- | src/docs/bind_instead_of_map.txt | 22 |
1 files changed, 0 insertions, 22 deletions
diff --git a/src/docs/bind_instead_of_map.txt b/src/docs/bind_instead_of_map.txt deleted file mode 100644 index 148575803d3..00000000000 --- a/src/docs/bind_instead_of_map.txt +++ /dev/null @@ -1,22 +0,0 @@ -### 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 }); -``` \ No newline at end of file |
