1
0
Fork 0
mirror of https://github.com/notohh/rustlings.git synced 2024-12-20 15:38:09 -05:00
rustlings/solutions/05_vecs/vecs2.rs
2024-06-21 15:06:50 +02:00

55 lines
1.4 KiB
Rust

fn vec_loop(input: &[i32]) -> Vec<i32> {
let mut output = Vec::new();
for element in input {
output.push(2 * element);
}
output
}
fn vec_map_example(input: &[i32]) -> Vec<i32> {
// An example of collecting a vector after mapping.
// We map each element of the `input` slice to its value plus 1.
// If the input is `[1, 2, 3]`, the output is `[2, 3, 4]`.
input.iter().map(|element| element + 1).collect()
}
fn vec_map(input: &[i32]) -> Vec<i32> {
// We will dive deeper into iterators, but for now, this is all what you
// had to do!
// Advanced note: This method is more efficient because it automatically
// preallocates enough capacity. This can be done manually in `vec_loop`
// using `Vec::with_capacity(input.len())` instead of `Vec::new()`.
input.iter().map(|element| 2 * element).collect()
}
fn main() {
// You can optionally experiment here.
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_vec_loop() {
let input = [2, 4, 6, 8, 10];
let ans = vec_loop(&input);
assert_eq!(ans, [4, 8, 12, 16, 20]);
}
#[test]
fn test_vec_map_example() {
let input = [1, 2, 3];
let ans = vec_map_example(&input);
assert_eq!(ans, [2, 3, 4]);
}
#[test]
fn test_vec_map() {
let input = [2, 4, 6, 8, 10];
let ans = vec_map(&input);
assert_eq!(ans, [4, 8, 12, 16, 20]);
}
}