Discussion on: AoC Day 1: Chronal Calibration

const fs = require('fs');

const datas = fs.readFileSync('input.txt', 'utf-8');
let currFrequency = new Set();

const changes = datas.split(/\n|\r/m)
    .map(Number);

let frequency = 0;
let i = 0;

while (true) {
    frequency += changes[i];
    if (currFrequency.has(frequency)) {
        console.log(frequency);
        break;
    }
    currFrequency.add(frequency);
    i = i === changes.length - 1 ? 0 : i + 1;
}