adventofcode2021

p1.js

const fs = require('fs');

const file = fs.readFileSync(`./${process.argv[2]}`);
const numbers = file.toString().split("\n").map(e => +e);
const increases = numbers.map((n, i, a) => n > a[i-1]);
const count = increases.filter(e => e).length;

console.log(count);

p2.js

const fs = require('fs');

const file = fs.readFileSync(`./${process.argv[2]}`);
const numbers = file.toString().split("\n").map(e => +e);
const sums = numbers.map((n, i, a) => n + a[i+1] + a[i+2]).filter(Number);
const increases = sums.map((n, i, a) => n > a[i-1]);
const count = increases.filter(e => e).length;

console.log(count);