Remove duplicate in a string - javascript

Question

I have a string in javascript where there are a lot of duplicates. For example I have:

var x = "Int32,Int32,Int32,Int32,Int32,Int32,Int32,Int32,Int32,Double,Double,Double"

What can I do to delete duplicates and to get for example x="Int32,Double"?

Does this answer your question? [Get all unique values in a JavaScript array (remove duplicates)](https://stackoverflow.com/questions/1960473/get-all-unique-values-in-a-javascript-array-remove-duplicates) — Liam, Nov 04 '21 at 09:09

MinusFour · Accepted Answer · 2016-02-24T18:21:17.707

55

With Set and Array.from this is pretty easy:

Array.from(new Set(x.split(','))).toString()

var x = "Int32,Int32,Int32,Int32,Int32,Int32,Int32,Int32,Int32,Double,Double,Double"
x = Array.from(new Set(x.split(','))).toString();
document.write(x);

edited Feb 24 '16 at 18:21

answered Feb 24 '16 at 18:09

MinusFour

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1

well done :) ^_^ but can u provide sample please on jsfiddle ? – solimanware Feb 24 '16 at 18:11
6

@Microsmsm why...you can run this right in your console. And why can't you make a fiddle for it? – charlietfl Feb 24 '16 at 18:12
@Microsmsm there you go. – MinusFour Feb 24 '16 at 18:21
@Microsmsm - and note that you have to be using the latest Chrome or Firefox for that to work – adeneo Feb 24 '16 at 18:22
1

And, it could be shortened with `x = [...new Set(x.split(','))].join(',');` – adeneo Feb 24 '16 at 18:27

adeneo · Answer 2 · 2016-02-24T18:24:00.267

4

If you have to support current browsers, you can split the array and then filter it

var x = "Int32,Int32,Int32,Int32,Int32,Int32,Int32,Int32,Int32,Double,Double,Double";
    
var arr = x.split(',');
    
x = arr.filter(function(value, index, self) { 
    return self.indexOf(value) === index;
}).join(',');

document.body.innerHTML = x;

edited Feb 24 '16 at 18:24

answered Feb 24 '16 at 18:11

adeneo

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score 3 · Answer 3 · answered Apr 23 '19 at 04:16

3

Use new js syntax remove Dupicate from a string.

String.prototype.removeDuplicate = Function() {
  const set = new Set(this.split(','))
  return [...set].join(',')
}
x.removeDuplicate()

answered Apr 23 '19 at 04:16

TiglathPileser

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score 2 · Answer 4 · answered Jun 02 '19 at 14:09

  function myFunction(str) {
    var result = "";
    var freq = {};
    for(i=0;i<str.length;i++){
       let char = str[i];
       if(freq[char]) {
        freq[char]++;      
       } else {
        freq[char] =1
        result = result+char;
       }
    }
    return result;
  }

score 2 · Answer 5 · answered Jan 29 '20 at 12:29

2

That is a more readable and better parameterized solution:

var x = "Int32,Int32,Int32,Int32,Int32,Int32,Int32,Int32,Int32,Double,Double,Double"
var removeDup = [...new Set(x.split(","))].join(",");

//result "Int32,Double"

answered Jan 29 '20 at 12:29

Crepkey

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score 2 · Answer 6 · answered Aug 10 '21 at 19:38

2

Its simple just remove duplicates in string using new Set and join them.

var x = "Int32,Int32,Int32,Int32,Int32,Int32,Int32,Int32,Int32,Double,Double,Double";
console.log([...new Set(x)].join(""));

answered Aug 10 '21 at 19:38

Gs malhotra

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`new Set` splitting by a comma... Javascript doesn't stop surprising in ages. – xamgore Aug 10 '21 at 20:03

Mohammad Basit · Answer 7 · 2020-04-21T08:48:31.763

Check This out -

removeDuplicates() function takes a string as an argument and then the string split function which is an inbuilt function splits it into an array of single characters. Then the arr2 array which is empty at beginning, a forEach loop checks for every element in the arr2 - if the arr2 has the element it will not push the character in it, otherwise it will push. So the final array returned is with unique elements. Finally we join the array with the join() method to make it a string.

const removeDuplicates = (str) => {
const arr = str.split("");
const arr2 = [];

arr.forEach((el, i) => {
 if (!arr2.includes(el)) {
    arr2.push(el);
   }
 });
 return arr2.join("").replace(",", "").replace("", " ");
};

console.log(removeDuplicates( "Int32,Int32,Int32,Int32,Int32,Int32,Int32,Int32,Int32,Double,Double,Double"));

Please add some explanation to your answer such that others can learn from it — Nico Haase, Apr 20 '20 at 13:49

score 0 · Answer 8 · answered Feb 24 '16 at 18:13

0

function removeDuplicate(x)
{
    var a = x.split(',');
    var x2 = [];
    for (var i in a)
        if(x2.indexOf(a[i]) == -1) x2.push(a[i])
    return  x2.join(',');
}

answered Feb 24 '16 at 18:13

thanhpk

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score 0 · Answer 9 · answered May 08 '18 at 15:20

function removeDups(s) {
let charArray = s.split("");
  for (let i = 0; i < charArray.length; i++) {
    for (let j = i + 1; j < charArray.length; j++)
      if (charArray[i] == charArray[j]) {
        charArray.splice(j, 1);
        j--;
      }
  }
  return charArray.join("");
}
console.log(removeDups("Int32,Int32,Int32,InInt32,Int32,Double,Double,Double"));

score 0 · Answer 10 · answered Sep 19 '21 at 07:03

0

You can use Set()

const result = Array.from(new Set(x)).join('')

var x = "Int32,Int32,Int32,Int32,Int32,Int32,Int32,Int32,Int32,Double,Double,Double"
const result = Array.from(new Set(x)).join('')

console.log(result)

answered Sep 19 '21 at 07:03

Kritish Bhattarai

1,501
15
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score 0 · Answer 11 · answered May 02 '22 at 07:13

0

you can use the replaceAll function:

let str = "/Courses/"

let newStr = str.replaceAll('/', '')

console.log(newStr) // result -> Courses

answered May 02 '22 at 07:13

Virinchi Manepalli

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score -1 · Answer 12 · answered May 26 '21 at 08:34

-1

const str =  "Int32,Int32,Int32,Int32,Int32,Int32,Int32,Int32,Int32,Double,Double,Double";
const usingSpread = [...str]
const duplicatesRemove = [...new Set(usingSpread)]
const string = duplicatesRemove.join("")
console.log("After removing  duplicates: " + string)

STEPS

convert string to character array using spread operator
new Set will implicitly remove duplicate character
convert character array to string using join("") method

answered May 26 '21 at 08:34

Amit Sharma

1

Your code splits the input string into individual characters instead of commas. It works for the OP's example, but will fail for inputs like `"Int32,Float,Double"`. – Phil Kang May 26 '21 at 09:47

Remove duplicate in a string - javascript

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