How to remove duplicate chars form string? - JS

Question

I need to remove duplicate characters from string, for example: "abcdab" => "abcd" "aaabbc" => "abc" How to do it on JS (maybee with using $.unique or something else) ?

score 5 · Accepted Answer · edited Jul 27 '17 at 18:53

5

function unique(str) {
  var result = '';
  for(var i = 0; i < str.length; i++) {
    if(result.indexOf(str[i]) < 0) {
      result += str[i];
    }
  }
  return result;
}

console.log(
  unique('abcdab'),
  unique('aaabbc')
);

edited Jul 27 '17 at 18:53

Chris Happy

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answered Sep 21 '15 at 22:08

Amit

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John Moses · Answer 2 · 2015-09-22T04:57:26.417

0

I would turn the string into an array with split("") and pass it to underscore's unique function then join it back up.

$.unique("abcdab".split("")).join("");

edit: working jsbin http://jsbin.com/wakonepala/1/edit?js,console

edited Sep 22 '15 at 04:57

answered Sep 21 '15 at 22:03

John Moses

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FWIW, I like my answer better than any of the "marked as duplicate" answer as it is shorter. – John Moses Sep 21 '15 at 22:08
That's jQuery, and doesn't work. – Amit Sep 21 '15 at 22:13
Thank, this is also a good solution. – Letfar Sep 21 '15 at 22:40
Hey @Amit, I added a jsbin to show it working. – John Moses Sep 22 '15 at 04:57
Again, it's ***not underscore***, and it [***doesn't work***](https://api.jquery.com/jQuery.unique/) (only works for DOM objects, sorts original array in place - so modifies input and returns a sorted result) – Amit Sep 22 '15 at 05:44

How to remove duplicate chars form string? - JS

2 Answers2