filter() {
    this.empleadosQuery.empleados$.subscribe(value => this.dataSource = value);
    this.dataSource = this.dataSource.filter((empleado) => this.checkFilter(empleado));
  }

  checkFilter(empleado) {
    this.formatFilter(empleado);

    for (let i = 0; i > this.empleadoFormated.length; i++) {
      if (this.empleadoFormated[i].includes(this.search)) {
        return true;
      } else {
        return false;
      }
    }
  }

  formatFilter(empleado) {
    this.search = this.replaceCharacters(this.search);
    this.empleadoFormated = this.termsOfSearch.map( term => this.replaceCharacters(empleado[term]));
  }

  replaceCharacters(value) {
    if (value) {
      return value.trim().toLowerCase().normalize('NFD').replace(/[\u0300-\u036f]/g, '');
    }
  }