axeman/advent-of-code-2023
1
0
Fork 0
Code Issues Pull requests Packages Projects Releases Wiki Activity

[rust] Use collect for traversing!

Browse source 
Thanks to https://floss.social/@janriemer/111511019839280544
This commit is contained in:
Akshay Mankar 2023-12-02 14:47:04 +01:00
parent a2637587e9
commit 8dad919572
Signed by: axeman
GPG key ID: CA08F3AB62369B89
1 changed files with 5 additions and 24 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

29
rust/src/day2.rs
View file

@ -95,9 +95,8 @@ impl FromStr for Revelation {
type Err = String; type Err = String;
fn from_str(s: &str) -> Result<Self, Self::Err> { fn from_str(s: &str) -> Result<Self, Self::Err> {
let revelation_results: Vec<_> = s.split(", ").map(ColourRevelation::from_str).collect(); let revelation_result: Result<Vec<_>, _> = s.split(", ").map(ColourRevelation::from_str).collect();
let revelations_result = traverse_results(revelation_results); revelation_result.and_then(|revelations| {
revelations_result.and_then(|revelations| {
let reds = extract_colour(revelations.clone(), String::from("red")); let reds = extract_colour(revelations.clone(), String::from("red"));
let greens = extract_colour(revelations.clone(), String::from("green")); let greens = extract_colour(revelations.clone(), String::from("green"));
let blues = extract_colour(revelations, String::from("blue")); let blues = extract_colour(revelations, String::from("blue"));
@ -135,10 +134,10 @@ impl FromStr for Game {
.replace("Game ", "") .replace("Game ", "")
.parse() .parse()
.map_err(|e| format!("Invalid game id: {}", e)); .map_err(|e| format!("Invalid game id: {}", e));
let revelations_results: Vec<Result<Revelation, _>> = let revelations_result: Result<Vec<Revelation>, _> =
revelations_str.split("; ").map(|x| x.parse()).collect(); revelations_str.split("; ").map(|x| x.parse()).collect();
game_id_result.and_then(|id| { game_id_result.and_then(|id| {
traverse_results(revelations_results) revelations_result
.and_then(|revelations| Ok(Game { id, revelations })) .and_then(|revelations| Ok(Game { id, revelations }))
}) })
} }
@ -148,23 +147,5 @@ impl FromStr for Game {
} }
fn parse_games(s: &str) -> Result<Vec<Game>, String> { fn parse_games(s: &str) -> Result<Vec<Game>, String> {
traverse_results(s.split('\n').map(Game::from_str).collect()) s.split('\n').map(Game::from_str).collect()
}
// Me: Mom, can we have travese.
// Mom: We got traverse at home.
// Traverse at home:
fn traverse_results<A, B>(results: Vec<Result<A, B>>) -> Result<Vec<A>, B>
where
Vec<A>: Clone,
{
results.into_iter().fold(Ok(Vec::new()), |acc, res| {
acc.and_then(|vec| {
res.and_then(|r| {
let mut vectemp = vec.clone();
vectemp.push(r);
Ok(vectemp)
})
})
})
} }