Untitled

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>

<script id="jsbin-javascript">
let items = ['Work Order', 'workOrder', 'work order'];


console.log(getHeaderFieldsWihoutDuplicates(items))

function getHeaderFieldsWihoutDuplicates(fieldsArray) {
let newItems = [];
fieldsArray.forEach(i => {
  var item = i.replace(/\s/g, '').toLowerCase();
  // create a regex for the new item
  let regA = new RegExp(item + '\d?');
  // get same item array
  let sameItems = newItems.filter((a)=> {
    if (a.match(regA)) {
     return a;
    }
  });
  // check length
  if (sameItems.length === 0) {
    // if there is no existing items then add the item
    newItems.push(item);
  } else {
    // if there are items then add with index prefix
    newItems.push(item + sameItems.length);
  }

});// end of forEach
  return newItems;
}
</script>


<script id="jsbin-source-javascript" type="text/javascript">let items = ['Work Order', 'workOrder', 'work order'];


console.log(getHeaderFieldsWihoutDuplicates(items))

function getHeaderFieldsWihoutDuplicates(fieldsArray) {
let newItems = [];
fieldsArray.forEach(i => {
  var item = i.replace(/\s/g, '').toLowerCase();
  // create a regex for the new item
  let regA = new RegExp(item + '\d?');
  // get same item array
  let sameItems = newItems.filter((a)=> {
    if (a.match(regA)) {
     return a;
    }
  });
  // check length
  if (sameItems.length === 0) {
    // if there is no existing items then add the item
    newItems.push(item);
  } else {
    // if there are items then add with index prefix
    newItems.push(item + sameItems.length);
  }

});// end of forEach
  return newItems;
}</script></body>
</html>