[Javascript] Sort by multi factors

For example, we have a 2D arrays;

const arys = [
  ['abw', ],
  ['bcd', ],
  ['dcw', ]
];

We want to sort by the number first, if the number are the same, then we want to sort by name DESC:

So the result should be:

[ [ 'abw',  ], [ 'dcw',  ], [ 'bcd',  ] ]

const result = arys.sort((a, b) => {
  if (b[] > a[]) {
    return true
  } else if (b[]  < a[]) {
    return false;
  } else {
    return b[].toLowerCase().localeCompare(a[].toLowerCase())
  }
});