Sorting nested arrays of objects by date

Question

I\'m trying to sort an array that looks like this:

var dateGroups = [
  [
     {age:20, date: Fri Feb 03 2012 14:30:00 GMT+1100 (EST)}, 
     {age:12, date:          


        

Answer 1

You can sort them by passing a custom sort function to Array.sort.

dateGroups.sort(function(a, b) {
    return b[0].date.getTime() - a[0].date.getTime();
});

The custom function needs to return a number less than zero (a comes before b), greater than zero (a comes after b) or zero (a and b are equal).