Lecture4 draft

[connortsui20]

First draft for lecture 4 is here!

This lecture was a bit more straightforward, but I did add a few extra things that the rust book doesnt have, mainly a sneak peak at deref coercion and more examples of generic impls.

Right now I'd like to talk more about the hash map and examples but this lecture is already pretty long. I think we definitely want to prioritize hash maps on the homework.

Another potential issue is that there are a few slides that have a LOT of code on them. I think we can talk through it, but if the projector we have is super small it might actually be overwhelming...

[jurplel]

have not reviewed yet, but having too much code on a slide is really bad. In general, text-heavy slides are not great, although I'm not sure of a better way to do it for much of this course.

This is where I would suggest looking deeper into if it is possible to draw circles around or emphasize parts of the code in a visual way

I'll try to find some solution for this for lecture 3

[jurplel]

Reviewing this is next on my list

[jurplel]

substantial changes for hashmap

• removed "try using them and see what compiler error you get!" from code block hash maps and ownership slide—thought it was something to say out loud
• added "Shorter and often more performant"
• removed "be sure to check out documentation for entry", because i looked at it and i don't think it added very much over what we covered. seems v. simple. open to discussion for sure

more coming when i do generics tmrw hopefully. i have spent so many hours on this, i think i need to go faster

[jurplel]

important changes:

• removed "try using them and see what compiler error you get!" from code block hash maps and ownership slide—thought it was something to say out loud
• added "Shorter and often more performant"

[jurplel]

Done reviewing, I'll address your comments later today + review your other PR + review the homework