math & informatics teacher
function reverse(line) {
return [...line].reverse().join("");
}
function extractDigits(lines) {
return lines.map((s) => Number(s.match(/\d/) + reverse(s.match(/\d/))));
}
function part1(input) {
return AOC.sum(extractDigits(input.split("\n")));
}
words = "one,two,three,four,five,six,seven,eight,nine".split(",")
lookup = words.map(reverse).reduce(
(lu, w, i) => ({ ...lu, [w]: `${i + 1}` }),
words.reduce((lu, w, i) => ({ ...lu, [w]: `${i + 1}` }), {})
)
function extractWordsAndDigits(lines) {
const fMatch = RegExp(words.join("|") + "|\\d");
const rMatch = RegExp(words.map(reverse).join("|") + "|\\d");
const toDigit = (token, regex) => {
const digit = token.match(regex)[0];
return digit.length === 1 ? digit : lookup[digit];
};
return lines.map((s) =>
Number(toDigit(s, fMatch) + toDigit(reverse(s), rMatch))
);
}
function part2(input) {
return AOC.sum(extractWordsAndDigits(input.split("\n")));
}
Purpose-built for displays of data
Observable is your go-to platform for exploring data and creating expressive data visualizations. Use reactive JavaScript notebooks for prototyping and a collaborative canvas for visual data exploration and dashboard creation.
