Algorithm for grouping or collecting equal elements in an array

collector.js

const nroList = [1, 4, 1, 3, 2, 4];
const collector = [];
let qty = 1;

nroList.forEach((nro, index) => {
  qty = 1;

  if (!collector.find(item => item.nro === nro)) {
    for (let i = 0; i < nroList.length; i++) {
      const nroCurrent = nroList[i];

      if (i === index) continue;
      else if (nroCurrent === nro) qty++;
    }

    collector.push({ nro, qty });
  }
});

console.log(collector);

/* out:
  0: {nro: 1, qty: 2}
  1: {nro: 4, qty: 2}
  2: {nro: 3, qty: 1}
  3: {nro: 2, qty: 1}
*/