ReactiveTable.publish not return Expected data to client side

[Akhileshkumarr]

I want to return a collection having tracking number with trackingNumber.substr(0, 2); , if i 'console' this on server side it gives as expected result but if i returned then in client side return value is not coming as expected (trackingNumber.substr(0, 2)) , it returns without any changes (just as trackingNumber)
ReactiveTable.publish( "OverallPackages", Packages, function() {
let packages = Packages.find({ trackingNumber : '7208457174' }).fetch(); packages.map((obj) => { obj.trackingNumber = obj.trackingNumber.substr(0, 2); console.log(obj); // result as expected (72) return obj; // not return as expected (7208457174) }); @here client side subscibe is-- return { rowsPerPage: 20, showColumnToggles: true, showRowCount:true, showFilter:true, collection:"OverallPackages"} Any idea to troubleshoot this ? help please thanx