You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

62 lines
1.4 KiB

## changes
### Instructions
Imagine you are working on some software to control smart lights in a house. You have access to an array of all the lights in that house.
Define the associated **function** `new`, and add it to the data structure `Light`. It should create a new light with the alias passed as an argument, with a brightness of .
Define the **function** `change_brightness`, which receives a `Vec` of lights, an `alias` and a `u8`value. It should find the light in the `Vec` by its alias, and set the value of the brightness.
### Expected Functions and Structure
```rust
#[derive(Debug, Eq, PartialEq, Clone)]
pub struct Light {
pub alias: String,
pub brightness: u8,
}
impl Light {
pub fn new(alias: &str) -> Self {
}
}
pub fn change_brightness(lights: &mut Vec<Light>, alias: &str, value: u8) {
}
```
### Usage
Here is an incomplete program to test your function
```rust
use changes::*;
fn main() {
// bedroom
let mut lights = vec![
Light::new("living_room"),
Light::new("bedroom"),
Light::new("rest_room"),
];
println!("brightness = {}", lights[0].brightness);
change_brightness(&mut lights, "living_room", 200);
println!("new brightness = {}", lights[0].brightness);
}
```
And its expected output
```console
$ cargo run
brightness = 0
new brightness = 200
$
```
### Notions
- [Example of Structs](https://doc.rust-lang.org/book/ch05-02-example-structs.html)
- [Keyword Self](https://doc.rust-lang.org/std/keyword.Self.html)