Remove first duplicate from an array of objects in JavaScript

Question

On input change I create an array of objects. When any value enter within the input field, it pushes objects into array but the problem is when a text field is updated, it does again push items into array. I need to update the array instead of pushing more items.

    var tableData = [];
    $('.aantalNumber').change(function(){
       var aantalNumberVal = $(this).val()
       var Productnummer = $(this).closest('tr').find('.product_number').text();
       var Productnaam = $(this).closest('tr').find('.product_name').text();
       var verpakking =$(this).closest('tr').find('.verpakking').text();
       
       tableData.push({aantalNumber:aantalNumberVal,Productnummer:Productnummer,Productnaam:Productnaam,verpakking:verpakking });
      console.log(tableData);
    })

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
   <tr>
      <td><input type="number" class="aantalNumber" name="Aantal1"></td>
      <td class="product_number">01454</td>
      <td class="product_name">Vendor Handdoeken ZZ vouw</td>
      <td class="verpakking">5000 velper verpakking</td>
    </tr>
    
     <tr>
      <td><input type="number" class="aantalNumber" name="Aantal2"></td>
      <td class="product_number">218031</td>
      <td class="product_name">Vendor Handdoeken ZZ vouw</td>
      <td class="verpakking">5000 velper verpakking</td>
    </tr>
    <!-- Repeated tr and so on -->

1. Figure out which of those array fields can uniquely identify an element. 2. Use array.find to test if it exists and locate it if it does. 3. If it exists, update it, otherwise push a new element to the array as you are doing. — James
– James, Commented Aug 17, 2020 at 12:20

Satinder singh · Accepted Answer · 2020-08-17 12:29:46Z

First check if value exist, if available then update else push into tableData

 var tableData = [];
 $('.aantalNumber').change(function() {
   var aantalNumberVal = $(this).val()
   var Productnummer = $(this).closest('tr').find('.product_number').text();
   var Productnaam = $(this).closest('tr').find('.product_name').text();
   var verpakking = $(this).closest('tr').find('.verpakking').text();

   if (tableData.some(tableData => tableData.Productnummer === Productnummer)) {
     updateTableData(Productnummer, aantalNumberVal);
   } else {
     tableData.push({
       aantalNumber: aantalNumberVal,
       Productnummer: Productnummer,
       Productnaam: Productnaam,
       verpakking: verpakking
     });
   }


   console.log(tableData);
 });

 function updateTableData(value, aantalNumber) {
   for (var i in tableData) {
     if (tableData[i].Productnummer == value) {
       tableData[i].aantalNumber = aantalNumber;
       break; //Stop this loop, we found it!
     }
   }
 }

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