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Tweaks from student feedback (#1061)

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* help students with the luhn exercise

* mention method-specific types in speaker notes

* Update src/exercises/day-2/luhn.md

Co-authored-by: Martin Geisler <martin@geisler.net>

---------

Co-authored-by: Martin Geisler <martin@geisler.net>
This commit is contained in:
Dustin J. Mitchell
2023-08-11 08:40:05 -04:00
committed by GitHub
parent 8956fab9bb
commit e596b80c03
2 changed files with 8 additions and 4 deletions
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10
src/exercises/day-2/luhn.md
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@ -6,8 +6,8 @@ following to validate the credit card number:
* Ignore all spaces. Reject number with less than two digits.
* Moving from right to left, double every second digit: for the number `1234`,
we double `3` and `1`.
* Moving from **right to left**, double every second digit: for the number `1234`,
we double `3` and `1`. For the number `98765`, we double `6` and `8`.
* After doubling a digit, sum the digits. So doubling `7` becomes `14` which
becomes `5`.
@ -16,8 +16,10 @@ following to validate the credit card number:
* The credit card number is valid if the sum ends with `0`.
Copy the following code to <https://play.rust-lang.org/> and implement the
function:
Copy the code below to <https://play.rust-lang.org/> and implement the function.
Try to solve the problem the "simple" way first, using `for` loops and integers.
Then, revisit the solution and try to implement it with iterators.
```rust