Advent of Code 2020 Day 4 Chapter 1

day4.ts

import { readFileSync } from 'fs';
import * as jf from 'joiful';

class Passport {
    @jf.string().required()
    public byr = '';
    @jf.string().required()
    public iyr = '';
    @jf.string().required()
    public eyr = '';
    @jf.string().required()
    public hgt = '';
    @jf.string().required()
    public hcl = '';
    @jf.string().required()
    public ecl = '';
    @jf.string().required()
    public pid = '';
    @jf.string().optional()
    public cid = '';
}

const isPassportValid = async (passport: any) => {
    try {
        await jf.validateAsClass(passport, Passport);
        // console.log(passport, true);
        return true;
    } catch (e) {
        // console.log(passport, false);
        return false;
    }
};

(async () => {
    const passports = readFileSync('input.txt').toString('utf8').split('\n\n');

    const parsePassport = (str: string) => {
        const obj: { [key: string]: string } = {};
        const kvs = str.split('\n')
                    .flatMap(line => line.split(' '))
                    .filter(x => x)
                    .map(kv => {
                        return kv.split(':')
                    });

        kvs.forEach(kv => {
            obj[kv[0]] = kv[1];
        });

        return obj;
    };
    
    const promises = passports.map(p => parsePassport(p)).map(async parsed => await isPassportValid(parsed));
    Promise.all(promises)
    .then(val => console.log(val.filter(x => x).length));
})();