Enum & From Trait | Rust Language

Learning to use the From trait with an Enum - using map to return an array of a different type.
Try the code in Rust Playground:
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play.rust-lang.org/?version=s...
#rustprogramming #learningrust #practiceRust

[@elirane85]

You don't really need to implement the "from_array" method. I mean, you can, but it always seemed a bit redundant to me.
There is a shorthand when using the map function on iterators if the operand signature matches the item type in the array:
```
let vehicle_array: [u32; 4] = [1, 2, 3, 4];
let vehicle_vec = vehicle_array.map(Vehicle::from);
```
So it's kinda simple without the extra method.
And if you really wanna be all "fancy" and add a variadic version of the function (a function that accept an arbitrary number or parameters), you can create a macro like this:
```
#[macro_export]
macro_rules! vehicle {
($($num:expr),*) => { [$(Vehicle::from($num)),*] };
}
```
Which allows you to call the function with any number of variables and get back an array like this:
```
let vehicle_vec = vehicle!(1, 2, 3, 4);
```
My approach is usually to implement as little functionality as possible to a struct. But that's just me, it's not necessarily a good or bad practice, I just like my API's as small and lean as possible.

[@learning_rust]

Thank you! - " implement as little functionality as possible to a struct" - I like that approach - I'm glad you commented, appreaciate it - it's invaluable to read stuff like this.
I guess the from_array method might be more suitable if it was part of a custom trait (maybe)

[@jasonkristian8457]

you lost me as soon as you opened NV,