rust-lang/rust-clippy
Detect creation of new collection when it could be emptied
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#16,520 opened on 2026/02/05
A-lintgood first issue
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Description
See https://github.com/uutils/coreutils/pull/10695
When a variable holding a collection (such as Vec/VecDeque/HashMap/BTreeMap) is replaced by a new empty instance, it can be more efficient to instead clear the existing one to be able to reuse the allocated memory.
For example, x = Vec::new() can be replaced by x.clear(): x will be an empty vector, except that the storage (and capacity) will be inherited from the previous instance.
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