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

I was actually working on this at the same time - the solution I came up with is pretty much identical to Anurag's.

However I thought it might be worth sharing as I had a slightly different way of calculating the frequency of occurrences, using the ternary operator and checking if the value has been counted yet in a slightly different way.

function sortByFrequencyAndFilter(myArray)
{
    var newArray = [];
    var freq = {};

    //Count Frequency of Occurances
    var i=myArray.length-1;
    for (var i;i>-1;i--)
    {
        var value = myArray[i];
        freq[value]==null?freq[value]=1:freq[value]++;
    }

    //Create Array of Filtered Values
    for (var value in freq)
    {
        newArray.push(value);
    }

    //Define Sort Function and Return Sorted Results
    function compareFreq(a,b)
    {
        return freq[b]-freq[a];
    }

    return newArray.sort(compareFreq);
}