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Why doesn't Rust's BTreeMap have a with_capacity() method? Disclaimer: I discovered a previous explanation here but I found it a little confusing, so I’m hoping mine is easier to follow. Rust’s HashMap (and HashSet and Vec) collections both offer an initialization method fn with_capacity(capacity: usize) that allocates enough memory up front to hold capacity elements. Why don’t BTreeMap (and BTree
Update (2019-07-04): Some kind folks have suggested changes on the implementations to make them more idiomatic, so the code here may differ from what’s currently in the repos. This is a subjective, primarily developer-ergonomics-based comparison of the three languages from the perspective of a Python developer, but you can skip the prose and go to the code samples, the performance comparison if yo
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