Question

I have a multidimensional array which I would like to sort by two factors: First the state and then the city alphabetically.

  var locations = [
                ['Baltimore', 'Maryland', 'MD'],
                ['Germantown', 'Maryland', 'MD'],
                ['Rockville', 'Maryland', 'MD'],
                ['San Francisco', 'California', 'CA'],
                ['San Diego', 'California', 'CA']
  ];

How can I sort them alphabetically based on these two factors?
First State, then City?
I know how to do it just be one factor, but not two..

Answer 1

locations.sort(function(x, y) {
   if (x[1] > y[1])       // if you want to sort by abbreviation,
     return 1;            // use [2] instead of [1].
   else if (x[1] < y[1])
     return -1;
   else if (x[0] > y[0])
     return 1;
   else if (x[0] < y[0])
     return -1;
   else
     return 0;
});