[hinkley]

Yeah this is a function called sort_by but I don’t think it’s doing the same thing.

    let (initial_values, stream) = (initial_values, stream)
            .filter(filter)
            .sort_by(new_sorter_lexicographic(vec![
                // Sort by latest event's kind.
                Box::new(new_sorter_latest_event()),
                // Sort rooms by their recency.
                Box::new(new_sorter_recency()),
                // Finally, sort by name.
                Box::new(new_sorter_name()),
            ]))
            .dynamic_head_with_initial_value(page_size, limit_stream);

That’s an api that would make an OG Java developer get tingles.

sortBy should be locking each object once and I’m reasonably sure this is happening at least three times. Author ends up approximating _.sortBy() at the bottom by introducing a struct.