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Diffstat (limited to 'src/tools/clippy/src/docs/manual_filter_map.txt')
-rw-r--r-- | src/tools/clippy/src/docs/manual_filter_map.txt | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/src/tools/clippy/src/docs/manual_filter_map.txt b/src/tools/clippy/src/docs/manual_filter_map.txt new file mode 100644 index 000000000..3b6860798 --- /dev/null +++ b/src/tools/clippy/src/docs/manual_filter_map.txt @@ -0,0 +1,19 @@ +### What it does +Checks for usage of `_.filter(_).map(_)` that can be written more simply +as `filter_map(_)`. + +### Why is this bad? +Redundant code in the `filter` and `map` operations is poor style and +less performant. + +### Example +``` +(0_i32..10) + .filter(|n| n.checked_add(1).is_some()) + .map(|n| n.checked_add(1).unwrap()); +``` + +Use instead: +``` +(0_i32..10).filter_map(|n| n.checked_add(1)); +```
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