How to sort an array by multiple values?

Question

JavaScript

Hello! There is a simple JS code:

vals = vals.sort(
   function(a, b) {return a[1] - b[1]}
);

It sorts a two dimensional array by its second value. But there is one minus: if there are several identical values ​​in the array that follow one after another, for example [12,13,1,1,1], they are skipped by the function, and they must be sorted by a different value, i.e. by a[0]. However, I have absolutely no idea how this can be done using sort(), and is it possible at all?.. Thanks in advance for any help, thanks.

Answer 1

vals = vals.sort(
   function(a, b) {
     if (a[1] == b[1]) {
       return a[0] - b[0];
     } else return a[1] - b[1];
   }
);

You can simplify and write in one line:

vals = vals.sort(
   function(a, b) { return a[1] == b[1] ? a[0] - b[0] : a[1] - b[1]; }
);