Part of #2478 to clean up code blocks when all that is needed is a
trivial debug print statement.
As mentioned in previous related PRs, in some places I've opted to
retain the use of println! because dbg! makes it less readable.
Co-authored-by: Eric Githinji <egithinji@google.com>
The content slides all use `fn main`, with the exception of the testing
segment. But with this change, where it makes sense exercises use tests
instead, and not both tests and `fn main`.
A small change in `book.js` supports running tests when a code sample
does not have `fn main` but does have `#[test]`, so these work
naturally.
Fixes#1581.
This is done in the speaker notes as it's a relatively minor point, but
one that students should have in the back of their mind when they
wonder, "hey, how does a `&Foo` match against `Foo` patterns??"
I think it would be good to simplify the expression evaluation exercise
by removing the error handling around the divide-by-zero case. I think
it overcomplicates the exercise and and adds confusion since at this
point we haven't introduced `Result` (or at least not in any detail).
This allows the students to just focus on writing the pattern matches on
`Expression` and `Op`, and allows the exercise to be shorter (and I
think we need to free up some time where we can, my classes often run
long and cut into how much time students have for exercises).
to catch wrong `right == 0` checks.
To change the number like this catches for example a wrong
implementation only looking if `right_result` is zero, but not checking
if we are doing a division.
Fixes#2070.
Previously we showed a forcibly de-nested version using both let and
if-let. this is not a construction that new learners of Rust are likely
to have seen or written, while nesting if-let is closer to patterns that
appear in other languages and better motivates the de-nesting
transformation to let-else
I find that `if let` makes the most sense to use when you don't have an
`else` case, otherwise it's generally clearer to express the same thing
with a `match`. This changes the `if let` example to be (arguably) a bit
more idiomatic and less verbose.
Based on feedback from @marshallpierce that mornings took about 2.5
hours, this adjusts a bunch of the morning times downward to try to
match that. In other words, this is trying to make the times in the
course more accurate, rather than reducing the amount of time available
for these slides.
This also updates the `course-schedule` tool to be able to show
per-segment timings.
This is the result of running `dprint fmt` after removing `src/` from
the list of excluded directories.
This also reformats the Rust code: we might want to tweak this a bit in
the future since some of the changes removes the hand-formatting. Of
course, this formatting can be seen as a mis-feature, so maybe this is
good overall.
Thanks to mdbook-i18n-helpers 0.2, the POT file is nearly unchanged
after this, meaning that all existing translations remain valid! A few
messages were changed because of stray whitespace characters:
msgid ""
"Slices always borrow from another object. In this example, `a` has to remain "
-"'alive' (in scope) for at least as long as our slice. "
+"'alive' (in scope) for at least as long as our slice."
msgstr ""
The formatting is enforced in CI and we will have to see how annoying
this is in practice for the many contributors. If it becomes annoying,
we should look into fixing dprint/check#11 so that `dprint` can annotate
the lines that need fixing directly, then I think we can consider more
strict formatting checks.
I added more customization to `rustfmt.toml`. This is to better emulate
the dense style used in the course:
- `max_width = 85` allows lines to take up the full width available in
our code blocks (when taking margins and the line numbers into account).
- `wrap_comments = true` ensures that we don't show very long comments
in the code examples. I edited some comments to shorten them and avoid
unnecessary line breaks — please trim other unnecessarily long comments
when you see them! Remember we're writing code for slides 😄
- `use_small_heuristics = "Max"` allows for things like struct literals
and if-statements to take up the full line width configured above.
The formatting settings apply to all our Rust code right now — I think
we could improve this with https://github.com/dprint/dprint/issues/711
which lets us add per-directory `dprint` configuration files. However,
the `inherit: true` setting is not yet implemented (as far as I can
tell), so a nested configuration file will have to copy most or all of
the top-level file.
This modifies the exercise to lean more into interesting `match`
statements. It also uses the standard `Result` type, based on feedback
that students could understand it sufficiently at this point in the
course.
Addresses #1565.
I've taken some work by @fw-immunant and others on the new organization
of the course and condensed it into a form amenable to a text editor and
some computational analysis. You can see the inputs in `course.py` but
the interesting bits are the output: `outline.md` and `slides.md`.
The idea is to break the course into more, smaller segments with
exercises at the ends and breaks in between. So `outline.md` lists the
segments, their duration, and sums those durations up per-day. It shows
we're about an hour too long right now! There are more details of the
segments in `slides.md`, or you can see mostly the same stuff in
`course.py`.
This now contains all of the content from the v1 course, ensuring both
that we've covered everything and that we'll have somewhere to redirect
every page.
Fixes#1082.
Fixes#1465.
---------
Co-authored-by: Nicole LeGare <dlegare.1001@gmail.com>
Co-authored-by: Martin Geisler <mgeisler@google.com>
* Update match-guards.md
Adding more information how match guards are different from simply using "if" inside of the match case, after the case has matched.
* Be consistent about naming of match arms.
Co-authored-by: Andrew Walbran <qwandor@google.com>
