How to Get all non-unique values from an array In JavaScript?

JavaScript

Nov 06, 2020

Hi Guys,

In this example,I will learn you how to to get all non-unique values from an array in javascript.you can easy simply get all non-unique values from an array in javascript.

This example first sort the array and then selects them one by one if they are non-unique.

Example:

<!DOCTYPE html> 
<html> 
<head> 
     <title> 
          JavaScript | Get all non-unique values. 
     </title> 
</head> 
<body style="text-align:center;" id="body"> 
     <h2 style="color: #af1bf9;"> 
          NiceSnippets 
     </h2> 
     <p id="nsnup" style="font-size: 16px;"> 
     </p> 
     <button onclick="gfg_Run()"> 
          click here 
     </button> 
     <p id="nsndown" style="color:#af1bf9; font-size: 20px; font-weight: bold;"> 
     </p> 
     <script> 
          var ns_up = document.getElementById("nsnup"); 
          var ns_down = document.getElementById("nsndown"); 
          var nsarr = [26, 42, 25, 5, 8, 45]; 
          var nssort_arr = nsarr.slice().sort(); 
          var nsres = []; 
          ns_up.innerHTML = "Original Array = [" + nsarr + "]";; 
          function gfg_Run() { 
               for (var i = 0; i < nssort_arr.length - 1; i++) { 
                    if (nssort_arr[i + 1] == nssort_arr[i]) { 
                         nsres.push(nssort_arr[i]); 
                    } 
               } 
               ns_down.innerHTML = "Non-Unique values are = " + nsres; 
          } 
     </script> 
</body> 
</html>

It will help you...