Sorting in JS

sortDesc(data) {
    const dtsrc = [...this.dataSource.data];
    const code = data.active.replace(/([a-z\xE0-\xFF])([A-Z\xC0\xDF])/g, '$1_$2').toLowerCase();
    this.dataSource.data = dtsrc.sort((a, b) => {
      if (a[code] > b[code]) {
        return -1
      }
      else if (a[code] < b[code]) {
        return 1
      }
      else return 0;
    });
  }

  sortData(data) {
    if (data.direction == 'asc') {
      this.sortAsc(data);
    } else {
      this.sortDesc(data);
    }
  }