public/subjects/borrow

borrow

Instructions

Complete the signature and the body of the str_len function that receives a string or a string literal and returns its length without taking ownership of the value (i.e, borrowing the value).

Expected Function (The signature needs to be completed)

pub fn str_len(s: ) -> usize {
}

Notions

Primitive Type str

Usage

Here is a possible program to test your function :

use borrow::*;

fn main() {
	let s = "hello";
	let s1 = "camelCase".to_string();

	println!("\tstr_len(\"{}\") = {}", s, str_len(s));
	println!("\tstr_len(\"{}\") = {}", s1, str_len(&s1));
}

And its output:

student@ubuntu:~/borrow/test$ cargo run
str_len("hello") = 5
str_len("camelCase") = 9
student@ubuntu:~/borrow/test$