![]() |
3 years ago | |
---|---|---|
.. | ||
README.md | 3 years ago |
README.md
borrow_me_the_reference
Instructions
Ownership is Rust's most unique feature, and it enables Rust to make memory safety guarantees without needing garbage collector. Therefore you must understand ownership in rust.
Create the following functions :
-
delete_and_backspace
, imagine that the-
represents thebackspace key
and the+
represents thedelete key
, this function must receive a borrowed string and turn this string into the string that applies thebackspaces
and thedeletes
. -
For example:
-
"helll-o" turns into "hello"
-
"he+lllo" turns into "hello"
-
-
is_correct
that borrows a Vector of string literals with some correct and incorrect math equations and replaces the correct equations with✔
and the wrong with✘
and returns ausize
with the percentage of correct equations.
Expected Functions
pub fn delete_and_backspace(s: &mut String) {
}
pub fn is_correct(v: &mut Vec<&str>) -> usize {
}
Notions
Usage
Here is a program to test your function
use borrow_me_the_reference::{delete_and_backspace, is_correct};
fn main() {
let mut a = String::from("bpp--o+er+++sskroi-++lcw");
let mut b: Vec<&str> = vec!["2+2=4", "3+2=5", "10-3=3", "5+5=10"];
// - If a value does **not implement Copy**, it must be **borrowed** and so will be passed by **reference**.
delete_and_backspace(&mut a); // the reference of the value
let per = is_correct(&mut b); // the reference of the value
println!("{:?}", (a, b, per));
// output: ("borrow", ["✔", "✔", "✘", "✔"], 75)
}
And its output
$ cargo run
("borrow", ["✔", "✔", "✘", "✔"], 75)
$