Reordering unique

gistfile1.txt

function unique(sortedArr) {
    var arr = [],
        i = -1,
        j = -1,
        len = sortedArr.length;
    
    while (++i < len) {
        if (arr[j] !== sortedArr[i]) {
            arr[++j] = sortedArr[i];
        }
    }
    return arr; 
}

console.log(unique([1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 5, 6]));