Sort a Javascript Array by frequency and then filter repeats

Question

What is an elegant way to take a javascript array, order by the frequency of the values, and then filter for uniques?

So,

[\"apples\", \"oranges\", \"o

Answer 1

var arr = ["apples", "oranges", "oranges", "oranges", "bananas", "bananas", "oranges"].sort();
var freq = {};
for (var s in arr) freq[s] = freq[s] ? freq[s] + 1 : 0;
arr.sort(function(a, b) { return freq[a] > freq[b] ? -1 : 1; });
for (var i = arr.length - 1; i > 0; i--) if (arr[i] == arr[i - 1]) arr.splice(i,1);
alert(arr.join(","));