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2023/01 less duplicate code

This commit is contained in:
kageru 2023-12-01 14:01:38 +01:00
parent eefb16d5be
commit 55636a082e
1 changed files with 6 additions and 5 deletions
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11
2023/src/bin/day01.rs
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@ -13,7 +13,7 @@ fn part1(parsed: &Parsed) -> usize {
parsed
.iter()
.map(|l| {
let l: Vec<_> = l.bytes().filter_map(|b| b.is_ascii_digit().then_some((b - b'0') as usize)).collect();
let l: Vec<_> = l.bytes().filter_map(digit_as_usize).collect();
l[0] * 10 + l.last().unwrap()
})
.sum()
@ -21,11 +21,12 @@ fn part1(parsed: &Parsed) -> usize {
const DIGITS: [&str; 9] = ["one", "two", "three", "four", "five", "six", "seven", "eight", "nine"];
fn digit_as_usize(b: u8) -> Option<usize> {
b.is_ascii_digit().then_some((b - b'0') as usize)
}
fn find_digit(s: &str) -> Option<usize> {
if s.as_bytes()[0].is_ascii_digit() {
return Some((s.as_bytes()[0] - b'0') as usize);
}
DIGITS.iter().zip(1usize..).find_map(|(&d, i)| s.starts_with(d).then_some(i))
digit_as_usize(s.as_bytes()[0]).or_else(|| DIGITS.iter().position(|d| s.starts_with(d)).map(|x| x + 1))
}
fn part2(parsed: &Parsed) -> usize {