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for-loop bonus explanation (#108)

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* for-loop bonus explanation
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鐘天楽 2023-01-06 04:15:16 -05:00 committed by GitHub
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src/exercises/day-1/solutions-morning.md
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@ -7,3 +7,8 @@
```rust
{{#include for-loops.rs}}
```
### Bonus question
It honestly doesn't work so well. It might seem that we could use a slice-of-slices (`&[&[i32]]`) as the input type to transpose and thus make our function handle any size of matrix. However, this quickly breaks down: the return type cannot be `&[&[i32]]` since it needs to own the data you return.
You can attempt to use something like `Vec<Vec<i32>>`, but this doesn't work very well either: it's hard to convert from `Vec<Vec<i32>>` to `&[&[i32]]` so now you cannot easily use `pretty_print` either.