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Complete vec1 and vec2

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This commit is contained in:
Evie Litherland-Smith 2023-12-16 10:55:41 +00:00
parent b91b661b3a
commit b71bff8509
2 changed files with 9 additions and 11 deletions
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4
exercises/vecs/vecs1.rs
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@ -7,11 +7,9 @@
// //
// 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)
} }

16
exercises/vecs/vecs2.rs
View file

@ -7,13 +7,11 @@
// //
// 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 element in v.iter_mut() { for element in v.iter_mut() {
// TODO: Fill this up so that each element in the Vec `v` is // TODO: Fill this up so that each element in the Vec `v` is
// multiplied by 2. // multiplied by 2.
??? *element *= 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].
@ -21,11 +19,13 @@ 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(|element| { v.iter()
// TODO: Do the same thing as above - but instead of mutating the .map(|element| {
// Vec, you can just return the new number! // TODO: Do the same thing as above - but instead of mutating the
??? // Vec, you can just return the new number!
}).collect() element * 2
})
.collect()
} }
#[cfg(test)] #[cfg(test)]