31 lines
820 B
JavaScript
31 lines
820 B
JavaScript
import fs from "fs";
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/**
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* Main function for Puzzle B
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*
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* @param {string} data - Puzzle input as a single string.
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* @returns {number} Sum of amount of questions answered positively by everyone per group.
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*/
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async function main(data) {
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const groups = data.split(/\r?\n\r?\n/).map((group) => group.split(/\r?\n/));
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/** @type {number[]} */
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const answer_count = [];
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for (const group of groups) {
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let answers = 0;
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for (const char of "abcdefghijklmnopqrstuvwxyz") {
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if (group.reduce((prev, cur) => prev && cur.includes(char), true)) {
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answers++;
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}
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}
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answer_count.push(answers);
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}
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return answer_count.reduce((prev, cur) => prev + cur, 0);
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}
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fs.readFile("input", (err, data) => {
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if (err) throw err;
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main(data.toString()).then(console.log).catch(console.error);
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});
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