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[Add] exercises/vecs

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This commit is contained in:
Phan Huy Hoang 2023-01-02 08:20:12 +07:00
parent 48394d5192
commit 5c17c42fae
2 changed files with 3 additions and 11 deletions
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4
exercises/vecs/vecs1.rs
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@ -4,11 +4,9 @@
// Make me compile and pass the test! // Make me compile and pass the test!
// Execute `rustlings hint vecs1` or use the `hint` watch subcommand for a hint. // Execute `rustlings hint vecs1` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
fn array_and_vec() -> ([i32; 4], Vec<i32>) { fn array_and_vec() -> ([i32; 4], Vec<i32>) {
let a = [10, 20, 30, 40]; // a plain array let a = [10, 20, 30, 40]; // a plain array
let v = // TODO: declare your vector here with the macro for vectors let v = vec![10, 20, 30, 40];
(a, v) (a, v)
} }

10
exercises/vecs/vecs2.rs
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@ -6,13 +6,9 @@
// //
// Execute `rustlings hint vecs2` or use the `hint` watch subcommand for a hint. // Execute `rustlings hint vecs2` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
fn vec_loop(mut v: Vec<i32>) -> Vec<i32> { fn vec_loop(mut v: Vec<i32>) -> Vec<i32> {
for i in v.iter_mut() { for i in v.iter_mut() {
// TODO: Fill this up so that each element in the Vec `v` is *i *= 2;
// multiplied by 2.
???
} }
// At this point, `v` should be equal to [4, 8, 12, 16, 20]. // At this point, `v` should be equal to [4, 8, 12, 16, 20].
@ -21,9 +17,7 @@ fn vec_loop(mut v: Vec<i32>) -> Vec<i32> {
fn vec_map(v: &Vec<i32>) -> Vec<i32> { fn vec_map(v: &Vec<i32>) -> Vec<i32> {
v.iter().map(|num| { v.iter().map(|num| {
// TODO: Do the same thing as above - but instead of mutating the *num * 2
// Vec, you can just return the new number!
???
}).collect() }).collect()
} }