Quickest way of finding unique objects in a javascript array -

i have array of 15,000 javascript objects. each object has 2 fields:

{   name    : "foo",   address : "bar@moo.com" } 

i want create new array stores unique email addresses , corresponding names. far have method:

// temp1 array of 15,000 objects var arr = [];  (var = 0; i<temp1.length; i++){    var count = 0;    if(!arr.length){arr.push(temp1[i])};    for(var x = 0; x<arr.length; x++){       if(temp1[i].address === arr[x].address){         count++;         if(temp1[i].name.length && !arr[x].name.length){arr[x] = temp1[i];} // choose new object if old 1 has no name field       }        if((x === arr.length -1) && count === 0){          arr.push(temp1[i])       }    } } 

i have added requirement in here - if object in arr has blank string name field, , temp1 object does, want store temp1 object instead.

my current method takes 30s run in chrome , not ideal.

edit: clarify, i'm asking whether there more efficient method in javascript find unique objects in array. 1 method above create new array, iterate against original , each 1 loop through in new array check duplicates. i'm wondering what's out that more efficient this.

here's possibility

var tmp = {};  temp1.foreach(function(item) {     var key = item.address;     add = tmp[key] = tmp[key] || item;     add.name = add.name || item.name; }); var addr = object.keys(tmp).map(function(t) { return tmp[t] }); 

caveat: ie9 or later - or use following polyfills lesser ie browsers

https://developer.mozilla.org/en-us/docs/web/javascript/reference/global_objects/array/map map

https://developer.mozilla.org/en-us/docs/web/javascript/reference/global_objects/array/foreach foreach

https://developer.mozilla.org/en-us/docs/web/javascript/reference/global_objects/object/keys object.keys

after taking consideration comments @dev-null

var tmp = {}, item, key, add, i, l = temp1.length, addr; for(i = 0; < l; i++) {     item = temp1[i];     key = item.address;     add = tmp[key] = tmp[key] || item;     add.name = add.name || item.name; }; addr = new array(object.keys(tmp).length); = 0; for(key in tmp) {     addr[i++] = tmp[key]; } 

that's on average twice fast first test (in firefox though)

and 64 times faster op's original script

edit: fastest though (in firefox)

var tmp = {}, item, key, add, i, l = temp1.length, addr; for(i = 0; < l; i++) {     item = temp1[i];     key = item.address;     add = tmp[key] = tmp[key] || item;     add.name = add.name || item.name; }; addr = object.keys(tmp).map(function(t) { return tmp[t] });