Remove duplicates from array of strings in Javascripts

Question

I have the following json array:

["aa", "bb", "cc", "dd", "bb"]

How to remove the duplicate values from it with javascript, so at the end I got:

["aa", "bb", "cc", "dd"]

https://stackoverflow.com/questions/9229645/remove-duplicate-values-from-js-array Try searching/googling before posting please. — Adam, Aug 08 '18 at 12:52

Ankit Agarwal · Accepted Answer · 2018-08-08T12:57:53.073

2

You can use Array.filter():

var arr = ["aa", "bb", "cc", "dd", "bb"];
var res = arr.filter(function(item, index){
  if(arr.lastIndexOf(item) === index){
    return true;
  }
}).sort(function(a, b){
  return a > b;
});
console.log(res);

edited Aug 08 '18 at 12:57

answered Aug 08 '18 at 12:54

Ankit Agarwal

30,378
5
37
62

1

btw, it works only for truthy values, because of returning the item instead of `true` - and it changes the order. – Nina Scholz Aug 08 '18 at 12:54
@NinaScholz thanks for suggestion. It does now. – Ankit Agarwal Aug 08 '18 at 12:58
you could simply use indexOf and take the first without later sorting (which may change the unsorted original order ...) – Nina Scholz Aug 08 '18 at 12:58

score 1 · Answer 2 · answered Aug 08 '18 at 12:54

1

console.log(_.uniq(["aa", "bb", "cc", "dd", "bb"]));

<script src="http://underscorejs.org/underscore-min.js"></script>

answered Aug 08 '18 at 12:54

Sujan Gainju

4,273
2
14
34

Remove duplicates from array of strings in Javascripts

2 Answers2