Remove duplicates in array separated by double commas in JavaScript

Question

I have an array in JavaScript like this

var data = [,A_1_VII,VII,V2,,A_1_VII,VII,V2,,A_1_VII,VII,V2,,B_1_XIV,XIV,V3,,B_2_XVI,XVI,V3]

when I alert in JavaScript it gives as below

,A_1_VII,VII,V2
,A_1_VII,VII,V2
,A_1_VII,VII,V2
,B_1_XIV,XIV,V3
,B_2_XVI,XVI,V3

But I want like this which is duplicates removed array

var unique_data = [,A_1_VII,VII,V2,,B_1_XIV,XIV,V3,,B_2_XVI,XVI,V3]

On alert it should give like this

,A_1_VII,VII,V2
,B_1_XIV,XIV,V3
,B_2_XVI,XVI,V3

What have you tried so far? Also your current JS example will throw an error. — evolutionxbox
– evolutionxbox, Commented Nov 14, 2017 at 10:27
That is a really strange javascript array. Is this code valid javascript? — Jasper Seinhorst
– Jasper Seinhorst, Commented Nov 14, 2017 at 10:27
@DontVoteMeDown I doubt that variable names can start with a comma. — Bojan Ivanac
– Bojan Ivanac, Commented Nov 14, 2017 at 10:29
@BojanIvanac: No, but arrays can have empty entries in them, which is what that array has. (This is as of ES2015+) For example: [,,,1,,,] is perfectly valid (in ES2015+). — T.J. Crowder
– T.J. Crowder, Commented Nov 14, 2017 at 10:32

Bheru Lal Lohar · Accepted Answer · 2017-11-14 10:41:33Z

1

First Thing your array contains string as a constant that's not going to work.

Secondly, if all of you value are strings you can do it as follows:

var data =[,"A_1_VII","VII","V2",,"A_1_VII","VII","V2",,"A_1_VII","VII","V2",,"B_1_XIV","XIV","V3",,"B_2_XVI","XVI","V3"];

var uniqueArray = data.filter(function(item, pos) {
    return data.indexOf(item) == pos;
})

alert(uniqueArray);

answered Nov 14, 2017 at 10:41

Bheru Lal Lohar

1,07011 silver badges18 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

bioinform Over a year ago

Not working man. I tried this already. Now also again I tried. But not working.

Bheru Lal Lohar Over a year ago

@bioinform did you put all your values into double quotes, as above codes are working fine click on "Run code snippet"

M0nst3R · Accepted Answer · 2017-11-14 10:39:32Z

1

Assuming the variables in your array are well defined, you can clean it up and remove duplicates with a for loop:

var data [/* ... */];
var unique_data = [];

for(let i = 0; i < data.length; i++) {
    if (data[i] && unique_data.indexOf(data[i]) === -1) {
        unique_data.push(data[i]);
    } 
}

Please note that the code above assumes that your array contains non-object types, otherwise the solution would need to use something more sophisticated than indexOf().

answered Nov 14, 2017 at 10:39

M0nst3R

5,3131 gold badge28 silver badges39 bronze badges

Comments

4b0 · Accepted Answer · 2017-11-14 10:54:05Z

1

You can create your unique function to remove duplicate entry and empty value from array like this.

var data =[,"A_1_VII,VII","V2,,A_1_VII","VII","V2",,"A_1_VII","VII","V2",,"B_1_XIV,XIV","V3",,"B_2_XVI,XVI,V3"]   
var unique_data = uniqueList(data);
alert(unique_data);
function uniqueList(list) {
  var uniqueResult = [];
  $.each(list, function(i, e) {
    if ($.inArray(e, uniqueResult) == -1 &&$.inArray(e, uniqueResult)!="")// chech for unique value and empty value
      uniqueResult.push(e);
  });
  return uniqueResult ;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

edited Nov 14, 2017 at 10:54

answered Nov 14, 2017 at 10:48

4b0

22.4k30 gold badges97 silver badges143 bronze badges

Collectives™ on Stack Overflow

Remove duplicates in array separated by double commas in JavaScript

3 Answers 3

2 Comments

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

2 Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related