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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/comparison_to_empty.txt | |
parent | Adding upstream version 1.64.0+dfsg1. (diff) | |
download | rustc-upstream/1.65.0+dfsg1.tar.xz rustc-upstream/1.65.0+dfsg1.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/comparison_to_empty.txt')
-rw-r--r-- | src/tools/clippy/src/docs/comparison_to_empty.txt | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/src/tools/clippy/src/docs/comparison_to_empty.txt b/src/tools/clippy/src/docs/comparison_to_empty.txt new file mode 100644 index 000000000..db6f74fe2 --- /dev/null +++ b/src/tools/clippy/src/docs/comparison_to_empty.txt @@ -0,0 +1,31 @@ +### What it does +Checks for comparing to an empty slice such as `""` or `[]`, +and suggests using `.is_empty()` where applicable. + +### Why is this bad? +Some structures can answer `.is_empty()` much faster +than checking for equality. So it is good to get into the habit of using +`.is_empty()`, and having it is cheap. +Besides, it makes the intent clearer than a manual comparison in some contexts. + +### Example + +``` +if s == "" { + .. +} + +if arr == [] { + .. +} +``` +Use instead: +``` +if s.is_empty() { + .. +} + +if arr.is_empty() { + .. +} +```
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