[robamu]

First draft of a collections exercise, fixes #16 .

The exercise itself is currently relatively short and only includes Vec, BTreeSet and HashMap. Maybe we should also add VecDeque? I included some quiz questions.

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[jonathanpallant]

Looks good - just some minor nits.

In general, I think the example Type we put inline in the next should be in the same format the audience needs to write it in their own program. That is String is OK because that type is in the prelude, but std::collections::HashMap needs qualifying because it is not.

I proposed some text changes but I don't recommend just accepting them in the Github UI because the paragraphs will probably need re-wrapping. Also you could probably slightly reformat them to make them better - Github was only letting me apply suggestions to one line at a time.

[jonathanpallant]

Suggested change

	allows to borrow non-`'static` data.
	allows you to borrow non-`'static` data.

[jonathanpallant]

On reflection, I think Q2 and Q3 are too advanced for this exercise. We would use this on day 2 of an Open Intro, and we don't cover threads and send/sync until the very end.

Discussing String and &str is OK - you could talk about modifying the original String after it has been placed in the collection (you get different outcomes depending on whether you moved it, cloned it, or borrowed it).

[robamu]

Okay. Maybe they can be moved into another exercise though (possibly in adapted form?).

Discussing String and &str is OK - you could talk about modifying the original String after it has been placed in the collection (you get different outcomes depending on whether you moved it, cloned it, or borrowed it).

this could be an additional step for the exercise as well.

[jonathanpallant]

Maybe they can be moved into another exercise though (possibly in adapted form?).

If there's an exercise where they make sense, then sure! But that's another PR.