jarjar/rustlings
1
0
Fork 0
mirror of https://github.com/rust-lang/rustlings.git synced 2026-01-12 05:39:19 +00:00
Code Issues Packages Projects Releases Wiki Activity

completed vectors

Browse Source
This commit is contained in:
Chris Cody 2022-10-09 17:16:31 +11:00
parent f3c171824b
commit d85a279735
3 changed files with 10 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
exercises/primitive_types/primitive_types5.rs
View File

@ -2,8 +2,6 @@
// Destructure the `cat` tuple so that the println will work. // Destructure the `cat` tuple so that the println will work.
// Execute `rustlings hint primitive_types5` or use the `hint` watch subcommand for a hint. // Execute `rustlings hint primitive_types5` or use the `hint` watch subcommand for a hint.
// I AM NOT DONE
fn main() { fn main() {
let cat = ("Furry McFurson", 3.5); let cat = ("Furry McFurson", 3.5);

6
exercises/vecs/vecs1.rs
View File

@ -4,13 +4,11 @@
// 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]; // TODO: declare your vector here with the macro for vectors
(a, v) return (a, v);
} }
#[cfg(test)] #[cfg(test)]

16
exercises/vecs/vecs2.rs
View File

@ -6,13 +6,11 @@
// //
// 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 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 = *i * 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].
@ -20,11 +18,13 @@ 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(|num| { v.iter()
// TODO: Do the same thing as above - but instead of mutating the .map(|num| {
// 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() num * 2
})
.collect()
} }
#[cfg(test)] #[cfg(test)]