public/subjects/changes

changes

Instructions

Imagine you are working on a software to control smart lights in a house. You have access to an array of all the lights in a house.

Define the associated function new to the data structure Light which creates a new light with the alias passed in the arguments and a brightness of 0.

Define the function change_brightness that receives a Vec of lights, an alias and a u8value. The function then sets the u8 value as the new brightness of the light identified by the alias in the Vec of lights.

Notions

Example of Structs Keyword Self

Expected Functions and Structure

#[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

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

$ cargo run
brightness = 0
new brightness = 200
$