A Unique Sorting Function in JS.

uniq.js

arr = [7, 7, 9, 2, 45, 6, 34, 43, 2, 6, 8, 2, 4, 100, 100, 100, 23, 34, 4];

var uniq = function(arr) {
    return arr.filter(function(value, index, self) {
        // only returns uniq numbers. A duplicate will yield a different indexOf
        return self.indexOf(value) === index;
    }).sort(function(x, y) {
        return x - y;
    });
};

console.log(uniq(arr)); // [ 2, 4, 6, 7, 8, 9, 23, 34, 43, 45, 100 ]