Better example for ownership transfer using String

[keshav-c]

I think the ownership transfer bits can use a better example.

The value 42 is just copied into the new variable, so this example does demonstrate the functioning of the borrow checker.

let a = 42;
let b = a;
println!("a is {}, b is {}", a, b);

Outputs

a is 42, b is 42

But on changing to a String value

let a = String::from("hello");
let b = a;
println!("a is {}, b is {}", a, b);

We get a better demonstration

   Compiling my-project v0.1.0 (/Users/keshav/my-project)
error[E0382]: borrow of moved value: `a`
 --> src/main.rs:8:34
  |
6 |     let a = String::from("hello");
  |         - move occurs because `a` has type `String`, which does not implement the `Copy` trait
7 |     let b = a;
  |             - value moved here
8 |     println!("a is {}, b is {}", a, b);
  |                                  ^ value borrowed here after move

I really like your approach to learning Rust. I crashed out of reading the book 2 times. But I think it's much better as a companion to this way of learning

[LukeMathWalker]

I agree, a String is a more fitting example. Thank you!