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