Advent of code (2020) - CODE 6 - 2

Advent of code (2020) - CODE 6 - 2

(async () => {
    const entries = (await(await fetch('https://adventofcode.com/2020/day/6/input')).text()).split('\n').map(item => item);
    const startTime = performance.now();
    let arr = [];
    let total = [];
    entries.forEach(item => {
        if (item.length > 0) {
            arr.push(Array.from(item).sort((a, b) => a > b ? 1 : -1));
        } else {
            let arrSet = new Set(arr.flat());
            let obj = {};
            arr.forEach(val => {
                val.forEach(iItem => {
                    if (arrSet.has(iItem)) {
                        obj[iItem] = obj[iItem] + 1 || 1;
                    }
                })
            });
            const saveArr = Object.values(obj).filter(i => i === arr.length).length;
            console.log(saveArr);
            total.push(saveArr);
            arr = [];
        }
    });
    const recuento = total.reduce((o, n) => o + n, 0);
    const endTime = performance.now();
    console.log(recuento, `${parseFloat(endTime - startTime).toFixed(4)} ms`);
})();