prefer-clear

Prefer clear over discarding a complete drain

Discarding a complete drain constructs an Iterator whose removed values are never observed.
Instead, you SHOULD call clear to remove the values directly.

- Category: performance
- Level: warning
- Fix: automatic
- Scope: module

Reported

function reset(values: int32[]): void {
    values.drain();
}
Accepted

function reset(values: int32[]): void {
    values.clear();
}
Prior art

- Clippy · clearwithdrain

language/linter/src/rules/performance/preferclear.rs:7