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Vecs

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This commit is contained in:
darko.deuric 2022-08-05 13:21:12 +02:00
parent 433a21da16
commit 224066da28
2 changed files with 3 additions and 5 deletions
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3
exercises/vecs/vecs1.rs
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@ -4,11 +4,10 @@
// 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<i32> = a.to_vec();// TODO: declare your vector here with the macro for vectors
(a, v) (a, v)
} }

5
exercises/vecs/vecs2.rs
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@ -6,13 +6,12 @@
// //
// 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 // TODO: Fill this up so that each element in the Vec `v` is
// multiplied by 2. // multiplied by 2.
??? *i *= 2; // dereference with * first, and then multiply by 2; // dereference with * first, and then multiply 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].
@ -23,7 +22,7 @@ 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 // TODO: Do the same thing as above - but instead of mutating the
// Vec, you can just return the new number! // Vec, you can just return the new number!
??? *num * 2
}).collect() }).collect()
} }