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December 4, 2020 13:41
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Advent of Code, 2020
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| function parseInput(input) { | |
| return input.split("\n"); | |
| } | |
| function parseRow(val) { | |
| let rule = val.replace(':', '').split(' '); | |
| return { | |
| low: rule[0].split('-')[0], | |
| high: rule[0].split('-')[1], | |
| character: rule[1][0], | |
| password: rule[2], | |
| }; | |
| } | |
| function isValidOne(row) { | |
| let rule = parseRow(row); | |
| let count = [...rule.password].filter(c => c === rule.character).length; | |
| return count >= rule.low && count <= rule.high; | |
| } | |
| function isValidTwo(row) { | |
| let rule = parseRow(row); | |
| let characters = [...rule.password]; | |
| return (characters[rule.low - 1] === rule.character) | |
| + (characters[rule.high - 1] === rule.character) | |
| === 1; | |
| } | |
| exports.one = (input) => { | |
| console.log( | |
| parseInput(input).map(row => isValidOne(row)).filter(val => val).length | |
| ); | |
| }; | |
| exports.two = (input) => { | |
| console.log( | |
| parseInput(input).map(row => isValidTwo(row)).filter(val => val).length | |
| ); | |
| }; |
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| function parseToRows(input) { | |
| return input.replace(/\n\n/g, '%').replace(/\n/g, ' ').split('%'); | |
| } | |
| function parseRow(row) { | |
| return row | |
| .trim() | |
| .split(' ') | |
| .reduce(function(carry, item) { | |
| let split = item.split(':'); | |
| carry[split[0]] = split[1]; | |
| return carry; | |
| }, {}) | |
| } | |
| function hasAllValues(passport, required) { | |
| return required.every(key => passport.hasOwnProperty(key)); | |
| } | |
| function isValid(passport) { | |
| return byrIsValid(passport.byr) | |
| && iyrIsValid(passport.iyr) | |
| && eyrIsValid(passport.eyr) | |
| && hgtIsValid(passport.hgt) | |
| && hclIsValid(passport.hcl) | |
| && eclIsValid(passport.ecl) | |
| && pidIsValid(passport.pid); | |
| } | |
| function byrIsValid(val) { | |
| let i = parseInt(val); | |
| return i >= 1920 && i <= 2002; | |
| } | |
| function iyrIsValid(val) { | |
| let i = parseInt(val); | |
| return i >= 2010 && i <= 2020; | |
| } | |
| function eyrIsValid(val) { | |
| let i = parseInt(val); | |
| return i >= 2020 && i <= 2030; | |
| } | |
| function hgtIsValid(val) { | |
| let cms = val.split('cm'); | |
| if (cms.length === 2) { | |
| i = parseInt(cms[0]); | |
| return i >= 150 && i <= 193; | |
| } | |
| let ins = val.split('in'); | |
| if (ins.length === 2) { | |
| i = parseInt(ins[0]); | |
| return i >= 59 && i <= 76; | |
| } | |
| } | |
| function hclIsValid(val) { | |
| let regex = /^#[0-9a-f]{6}$/g; | |
| return regex.test(val); | |
| } | |
| function eclIsValid(val) { | |
| return ['amb', 'blu', 'brn', 'gry', 'grn', 'hzl', 'oth'].includes(val); | |
| } | |
| function pidIsValid(val) { | |
| let regex = /^\d{9}$/g; | |
| return regex.test(val); | |
| } | |
| exports.one = (input) => { | |
| let rows = parseToRows(input).map(row => parseRow(row)); | |
| let required = ['byr', 'iyr', 'eyr', 'hgt', 'hcl', 'ecl', 'pid']; | |
| let valid = rows.map(row => hasAllValues(row, required)).filter(val => val); | |
| console.log(valid.length); | |
| }; | |
| exports.two = (input) => { | |
| let rows = parseToRows(input).map(row => parseRow(row)); | |
| let required = ['byr', 'iyr', 'eyr', 'hgt', 'hcl', 'ecl', 'pid']; | |
| let valid = rows.map(row => hasAllValues(row, required) ? row : null) | |
| .filter(val => val) | |
| .map(row => isValid(row) ? row : null) | |
| .filter(val => val); | |
| console.log(valid.length); | |
| }; |
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