mirror of
https://github.com/notohh/rustlings.git
synced 2024-11-22 14:02:22 -05:00
48 lines
1.2 KiB
Rust
Executable file
48 lines
1.2 KiB
Rust
Executable file
// move_semantics4.rs
|
|
// Refactor this code so that instead of having `vec0` and creating the vector
|
|
// in `fn main`, we instead create it within `fn fill_vec` and transfer the
|
|
// freshly created vector from fill_vec to its caller. Scroll for hints!
|
|
|
|
fn main() {
|
|
let vec0 = Vec::new();
|
|
|
|
let mut vec1 = fill_vec(vec0);
|
|
|
|
println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1);
|
|
|
|
vec1.push(88);
|
|
|
|
println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1);
|
|
|
|
}
|
|
|
|
fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
|
|
let mut vec = vec;
|
|
|
|
vec.push(22);
|
|
vec.push(44);
|
|
vec.push(66);
|
|
|
|
vec
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
// Stop reading whenever you feel like you have enough direction :) Or try
|
|
// doing one step and then fixing the compiler errors that result!
|
|
// So the end goal is to:
|
|
// - get rid of the first line in main that creates the new vector
|
|
// - so then `vec0` doesn't exist, so we can't pass it to `fill_vec`
|
|
// - we don't want to pass anything to `fill_vec`, so its signature should
|
|
// reflect that it does not take any arguments
|
|
// - since we're not creating a new vec in `main` anymore, we need to create
|
|
// a new vec in `fill_vec`, similarly to the way we did in `main`
|