86 lines
2.4 KiB
JavaScript
86 lines
2.4 KiB
JavaScript
const input = require('fs').readFileSync('1.input').toString().split('\n').filter(Boolean);
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const lookForFirstDigit = (line) => {
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for (let i = 0; i < line.length; i++) {
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const digit = parseInt(line[i]);
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if (!isNaN(digit)) {
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return [digit, i];
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}
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}
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}
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const lookForLastDigit = (line) => {
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for (let i = line.length - 1; i >= 0; i--) {
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const digit = parseInt(line[i]);
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if (!isNaN(digit)) {
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return [digit, i];
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}
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}
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}
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const part1 = () => {
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return input.reduce((acc, line) => {
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const first = lookForFirstDigit(line)[0];
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const last = lookForLastDigit(line)[0];
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const calibrated = first + "" + last;
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return acc + parseInt(calibrated);
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}, 0);
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}
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const words = ["one", "two", "three", "four", "five", "six", "seven", "eight", "nine"];
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const lookForFirstDigitWord = (line) => {
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let smallestIndex = 100000;
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let smallestIndexWord = "";
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for (const word of words) {
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const index = line.indexOf(word);
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if (index >= 0) {
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if (index < smallestIndex) {
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smallestIndex = index;
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smallestIndexWord = word;
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}
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}
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}
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if (smallestIndexWord === "") {
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return [0, 10000];
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}
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return [words.indexOf(smallestIndexWord) + 1, smallestIndex];
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}
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const lookForLastDigitWord = (line) => {
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let biggestIndex = -1;
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let biggestIndexWord = "";
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for (const word of words) {
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const index = line.indexOf(word);
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if (index >= 0) {
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if (index > biggestIndex) {
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biggestIndex = index;
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biggestIndexWord = word;
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}
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}
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}
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if (biggestIndexWord === "") {
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return [0, -1];
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}
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return [words.indexOf(biggestIndexWord) + 1, biggestIndex];
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}
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const part2 = () => {
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return input.reduce((acc, line) => {
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const firstDigit = lookForFirstDigit(line);
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const firstWord = lookForFirstDigitWord(line);
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const first = firstDigit[1] < firstWord[1] ? firstDigit[0] : firstWord[0];
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const lastDigit = lookForLastDigit(line);
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const lastWord = lookForLastDigitWord(line);
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const last = lastDigit[1] > lastWord[1] ? lastDigit[0] : lastWord[0];
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const calibrated = first + "" + last;
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return acc + parseInt(calibrated);
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}, 0);
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}
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console.log("Part 1: " + part1());
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console.log("Part 2: " + part2());
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