in vecs1.rs, I used Vec::from(a), but the hint didn't talk about it

[ThomasPrioul]

In vecs1.rs exercise where you have to instanciate a vector, I naturally leaned to methods like Vec::new, and Vec::from.
The hint says this:

Hint
In Rust, there are two ways to define a Vector.
1. One way is to use the `Vec::new()` function to create a new vector
   and fill it with the `push()` method.
2. The second way is to use the `vec![]` macro and define your elements
   inside the square brackets. This way is simpler when you exactly know
   the initial values.
   
Check this chapter: https://doc.rust-lang.org/book/ch08-01-vectors.html
of the Rust book to learn more.

But there is a third way with Vec::from which is not mentioned in the official docs either. Perhaps because it is a Trait ? But I found it slightly confusing that it's not even an option that will be "explained later".

[senekor]

Splitting hairs, maybe it could be said that Vec::from is not "defining" a vector, but "converting to" one. There are even more ways to create an instance of type Vec, we can't explain them all. Maybe it can just be reworded slightly so this list of two methods doesn't come across as exhaustive.

[senekor]

How about:

-In Rust, there are two ways to define a Vector.
+In Rust, there are two basic ways to define a Vector.

Would that make it clear that there are additional (less basic) methods to create a vector?

[ThomasPrioul]

I agree we're "splitting hairs" here. It made me look into the source code of vec::from which references to_vec which involves a few low level steps.
You are right, there are many more methods.

You could apply your proposed modification, at this point of the course it may not be wise to add too many details about other methods

[senekor]

for reference, applied in 9253217