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problem4b.js
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problem4b.js
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const fs = require('fs');
const data = fs.readFileSync('input4.txt', 'utf8').split('\n').map(line => line.trim());
let passports = [];
let passport = {};
const fields = [ 'byr', 'iyr', 'eyr', 'hgt', 'hcl', 'ecl', 'pid', 'cid' ];
const validators = {
byr(s) {
if (!s.match(/^\d\d\d\d$/)) {
return false;
}
let v = parseInt(s);
return (v >= 1920) && (v <= 2002);
},
iyr(s) {
if (!s.match(/^\d\d\d\d$/)) {
return false;
}
let v = parseInt(s);
return (v >= 2010) && (v <= 2020);
},
eyr(s) {
if (!s.match(/^\d\d\d\d$/)) {
return false;
}
let v = parseInt(s);
return (v >= 2020) && (v <= 2030);
},
hgt(s) {
const matches = s.match(/^(\d+)(cm|in)$/);
if (!matches) {
return false;
}
const [ dummy, val, unit ] = matches;
if (unit === 'cm') {
return (val >= 150) && (val <= 193);
} else if (unit === 'in') {
return (val >= 59) && (val <= 76);
} else {
throw new Error('Invalid unit despite regexp: ' + unit);
}
},
hcl(s) {
return s.match(/^#[0-9a-f]{6}$/);
},
ecl(s) {
return [ 'amb', 'blu', 'brn', 'gry', 'grn', 'hzl', 'oth' ].includes(s);
},
pid(s) {
return s.match(/^[0-9]{9}$/);
},
cid(s) {
return true;
}
};
for (const row of data) {
if (!row.length) {
passports.push(passport);
passport = {};
continue;
}
const clauses = row.split(' ');
for (clause of clauses) {
const [ dummy, name, value ] = clause.match(/^(\w+):(.*)$/);
passport[name] = value;
}
}
if (Object.keys(passport).length) {
passports.push(passport);
}
let valid = 0;
for (const passport of passports) {
const length = Object.keys(passport).length;
if ((length === 8) || ((length === 7) && (passport.cid === undefined))) {
if (!Object.keys(passport).find(key => !validators[key](passport[key]))) {
valid++;
}
}
}
console.log(valid);