* don't explain default trait methods early
* talk about Iterator before IntoIterator
* Defer discussion of trait objects to that chapter
* be more specific about turbofish, in speaker notes
* Suggesting to add `Default` to important traits.
This is a great trait to know about, it is used very often.
* Change `Implemented` to tuple struct.
It saves vertical space.
* Update iterator.md
Adding a Speaker Note emphasizing that all most all functional programming toolbox over collections can be found in the `Iterator` documentation.
* Wordsmithing
Co-authored-by: Andrew Walbran <qwandor@google.com>
It might give the impression that you can only write to a Vec that has capacity, when in fact Vec's Write impl will grow the storage as needed. While pre-allocating is probably a good efficiency win in many circumstances, I think it's probably worth minimizing the number of concepts in play in this example.
