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advent-of-code-2023
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[rust] Use collect for traversing! 

Thanks to https://floss.social/@janriemer/111511019839280544
main
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
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29
rust/src/day2.rs
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@ -95,9 +95,8 @@ impl FromStr for Revelation {
type Err = String;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let revelation_results: Vec<_> = s.split(", ").map(ColourRevelation::from_str).collect();
let revelations_result = traverse_results(revelation_results);
revelations_result.and_then(|revelations| {
let revelation_result: Result<Vec<_>, _> = s.split(", ").map(ColourRevelation::from_str).collect();
revelation_result.and_then(|revelations| {
let reds = extract_colour(revelations.clone(), String::from("red"));
let greens = extract_colour(revelations.clone(), String::from("green"));
let blues = extract_colour(revelations, String::from("blue"));
@ -135,10 +134,10 @@ impl FromStr for Game {
.replace("Game ", "")
.parse()
.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();
game_id_result.and_then(|id| {
traverse_results(revelations_results)
revelations_result
.and_then(|revelations| Ok(Game { id, revelations }))
})
}
@ -148,23 +147,5 @@ impl FromStr for Game {
}
fn parse_games(s: &str) -> Result<Vec<Game>, String> {
traverse_results(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)
})
})
})
s.split('\n').map(Game::from_str).collect()
}