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

vecs

Browse Source
This commit is contained in:
enforcer007 2022-11-13 12:50:28 +05:30
parent ce9400ff19
commit 3d81f2d8a6
2 changed files with 3 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
exercises/vecs/vecs1.rs
View File

@ -4,15 +4,13 @@
// 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::from(a);
(a, v) (a, v)
} }
#[cfg(test)] #[cfg(test)]
mod tests { mod tests {
use super::*; use super::*;

13
exercises/vecs/vecs2.rs
View File

@ -6,25 +6,16 @@
// //
// 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 = *i * 2
// multiplied by 2.
???
} }
// At this point, `v` should be equal to [4, 8, 12, 16, 20].
v v
} }
fn vec_map(v: &Vec<i32>) -> Vec<i32> { fn vec_map(v: &Vec<i32>) -> Vec<i32> {
v.iter().map(|num| { v.iter().map(|num| num * 2).collect()
// TODO: Do the same thing as above - but instead of mutating the
// Vec, you can just return the new number!
???
}).collect()
} }
#[cfg(test)] #[cfg(test)]