text: Array.prototype.reduce2 = function (callback, valorInicial) {
      const indiceInicial = valorInicial ? 0 : 1
      let acumulador = valorInicial || this[0]
      for (let i = indiceInicial; i < this.length; i++) {
        acumulador = callback(acumulador, this[i], i, this)
      }
      return acumulador
  };
  
  const soma = (total, valor) => total + valor;
  const nuns = [1, 2, 3, 4, 5, 6];
  console.log(nuns.reduce2(soma, 21));