I got this list of date array that I am trying to sort:

```
var arr = ['2017/12/16', 
'2017/05/01',
'2017/04/20',
'2017/03/10',
'2017/08/12',
'2017/03/06',
'2017/02/04',
'2017/01/07',
'2016/02/08',
'2015'09/08'];

```

They are in yyyy/mm/dd format. I tried to use this function to sort:

```
arr.sort(function(a,b) {
 a = a.split('/').reverse().join('');
  b = b.split('/').reverse().join('');
  return a > b ? 1 : a < b ? -1 : 0;
});

```

However, it tells me that a.split is not a function.