Remove Duplicates From Comma Delimited String

Question

How do I remove duplicates from a comma delimited string of integers using jquery/javascript?

My string is: 1,2,2,4,2,4,3,2,3,1,5,5,5,1,1,2

Solution 1

For one method, which doesn't demand writing the functionality from scratch or using some other js library check out duck-punching-with-jquery. (look for 'Example 2: $.unique() enhancement')

If you're willing to try some other library, the excellent underscorejs includes a 'uniq' method which accomplishes just what you need.

Solution 2

function spit(){
           var answer = ("1,2,2,4,2,4,3,2,3,1,5,5,5,1,1,2").split(',').filter(function(item, pos,self) {
              return self.indexOf(item) == pos;
           });
}

Solution 3

Here's a simple example.

var str1 = "a,b,c,a,d,e,b";
var characters = str1.split(",");
var distinctCharacters = [];
jQuery.each(characters, function(index, c) {
if (jQuery.inArray(c, distinctCharacters) > -1) {
        // do nothing
        alert("already exists " + c);
    } else {
        distinctCharacters.push(c);
    }
});
alert(distinctCharacters);​

Solution 4

From this post Remove Duplicates from JavaScript Array

var names = ["Mike","Matt","Nancy","Adam","Jenny","Nancy","Carl"];
var uniqueNames = [];
$.each(names, function(i, el){
 if($.inArray(el, uniqueNames) === -1) uniqueNames.push(el);
  });

Solution 5

good answers, there is also _.uniq() from the library underscore.js

View more solutions