Remove duplicate objects from an array using javascript

Question

I am trying to figure out an efficient way to remove objects that are duplicates from an array and looking for the most efficient answer. I looked around the internet everyt

Answer 1

I use this function. its not doing any sorting, but produces result. Cant say about performance as never measure it.

var unique = function(a){
    var seen = [], result = [];
    for(var len = a.length, i = len-1; i >= 0; i--){
        if(!seen[a[i]]){
            seen[a[i]] = true;
            result.push(a[i]);
        }
    }
    return result;
}

var ar = [1,2,3,1,1,1,1,1,"", "","","", "a", "b"]; console.log(unique(ar));// this will produce [1,2,3,"", "a", "b"] all unique elements.