Ownership is Rust's most unique feature. It enables Rust to make memory safety guarantees without needing a garbage collector. You must have a good understanding of ownership in rust.
> Ownership is Rust's most unique feature. It enables Rust to make memory safety guarantees without needing a garbage collector.
Understanding ownership is essential to take full advantage of Rust capabilities, it influences almost all aspects of the language.
Create the following functions:
- `delete_and_backspace`: which receives a borrowed string, and processes it. `-` represents the backspace key and `+` represents the delete key, so that `"helll-o"` and `"he+lllo"` are both converted to `"hello"`. The `-` and `+` characters should be removed from the string.
- `is_correct`: which borrows a Vector of string literals representing simple addition and subtraction equations. The function should replace the correct equations with `✔`, and the wrong ones with `✘`. It should return a `usize` with the percentage of correct equations.
- `do_operations`: which borrows a Vector of string literals representing simple addition and subtraction equations. The function should replace the operation with the result.
### Expected Functions
```rust
pub fn delete_and_backspace(s: &mut String) {
}
pub fn is_correct(v: &mut Vec<&str>) -> usize {
pub fn do_operations(v: &mut Vec<String>) {
}
```
### Dependencies
meval = "0.2"
### Usage
Here is a program to test your function
```rust
use borrow_me_the_reference::{delete_and_backspace, is_correct};
use borrow_me_the_reference::{delete_and_backspace, do_operations};
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"];
let mut b: Vec<String> = vec!["2+2", "3+2", "10-3", "5+5"];
// - 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
mikysett
2 years ago
committed by