advent of code day 4 part 1

day4_part1.js

const fs = require('fs')
const splitted = fs.readFileSync('./input.txt', 'utf-8').split(String.fromCharCode(0x0a).repeat(2))

function normalize(splt) {
	for (let i = 0; i < splt.length; i++) {
		splt[i] = splt[i].split(/\s+/).map((el) => { return el.split(':')[0] })
	}

	return splt
}

function solve(splt) {
	const mandatory = ['byr', 'iyr', 'eyr', 'hgt', 'hcl', 'ecl', 'pid']
	let numValid = 0
	let valid = false

	for (let i = 0; i < splt.length; i++) {
		for (let j = 0; j < mandatory.length; j++) {
			valid = splt[i].some((x) => x === mandatory[j])

			if (!valid) {
				break
			}
		}

		if (valid) {
			numValid++
		}

		valid = false
	}

	return numValid
}

console.log(solve(normalize(splitted)))