public/subjects/borrow_me_the_reference

borrow_me_the_reference

Instructions

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.

• 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

pub fn delete_and_backspace(s: &mut String) {
}

pub fn do_operations(v: &mut Vec<String>) {
}

Usage

Here is a program to test your function

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<String> = vec![
        "2+2".to_string(),
        "3+2".to_string(),
        "10-3".to_string(),
        "5+5".to_string(),
    ];

	delete_and_backspace(&mut a);
	do_operations(&mut b);

	println!("{:?}", (a, b));
}

And its output

$ cargo run
("borrow", ["4", "5", "7", "10"])
$

Notions

• Ownership