Use len() instead of iter().count()

[camsteffen]

What it does

Suggests using collection.len() instead of collection.iter().count().

Categories (optional)

• clippy::complexity

What is the advantage of the recommended code over the original code

Simpler, idiomatic.

Drawbacks

None.

Example

vec.iter().count()

Could be written as:

vec.len()

Notes

• Should work with all collections in std, and slices
• Should also work with into_iter
• Should also work with ExactSizeIterator::len

[TaKO8Ki]

Hi. I'm interested in this issue so I'd like to tackle it.

[TaKO8Ki]

@rustbot claim