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Diffstat (limited to 'src/docs/same_item_push.txt')
| -rw-r--r-- | src/docs/same_item_push.txt | 29 |
1 files changed, 0 insertions, 29 deletions
diff --git a/src/docs/same_item_push.txt b/src/docs/same_item_push.txt deleted file mode 100644 index 7e724073f8a..00000000000 --- a/src/docs/same_item_push.txt +++ /dev/null @@ -1,29 +0,0 @@ -### What it does -Checks whether a for loop is being used to push a constant -value into a Vec. - -### Why is this bad? -This kind of operation can be expressed more succinctly with -`vec![item; SIZE]` or `vec.resize(NEW_SIZE, item)` and using these alternatives may also -have better performance. - -### Example -``` -let item1 = 2; -let item2 = 3; -let mut vec: Vec<u8> = Vec::new(); -for _ in 0..20 { - vec.push(item1); -} -for _ in 0..30 { - vec.push(item2); -} -``` - -Use instead: -``` -let item1 = 2; -let item2 = 3; -let mut vec: Vec<u8> = vec![item1; 20]; -vec.resize(20 + 30, item2); -``` \ No newline at end of file |
