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Need help with formatting a child row slider - I am close but yet do far - HELP!!!!!

Need help with formatting a child row slider - I am close but yet do far - HELP!!!!!

Need help with formatting a child row slider - I am close but yet do far - HELP!!!!!

I just keep getting undefined.

CODE --> Javascript

function format ( object ) {
    let data=object;
    let x = '';
    let txt='';
    try {
  if (x != undefined) {
    // Executes for declared variables that are not undefined nor null
    console.log( 'X is okay ' + x)
  } // (Nothing happens)
} catch (x) {
  console.log('Catch ' + x) // ReferenceError: x is not defined
     for (x in data) {
              txt += data[x].Tillid + ' Line No:' + data[x].LineNo + ' ' +data[x].Productcode + ' ' + data[x].ProductDescription+' ' + parseFloat(data[x].LineSalePriceIncDisc).toFixed(2) +"\n";
     return '<div class="slider">'+ 
     '<table cellpadding="5" cellspacing="0" border="0" style="padding-left:50px;">'+
            '<td>Till Name:</td>'+
            '<td>'+ data[x].Tillid + '</td>'+
            '<td>Product Description:</td>'+
            '<td>Customer Name:</td>'+
            '<td>'+ console.log(data[x].ProductDescription)  +'</td>'+
            '<td>Extra info:</td>'+
            '<td>And any further details here (images etc)...</td>'+
example of data below:

{Tillid: "MAINTILL", LineNo: "1", Productcode: "15479", ProductDescription: "Cadent 1 Blk Lagre", SingleSalePrice: "380.0000", …}
{Tillid: "MAINTILL", LineNo: "2", Productcode: "11571", ProductDescription: "Helm 58-62 Mission EVO Silver", SingleSalePrice: "19.9900", …}

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