Question

What is the JavaScript equivalent function for CreateObject(“Scripting.Dictionary”)?
I have to convert following two statements from VBScript to JavaScript, anyone can help me to find a solution.

Set oInvoicesToCreate = CreateObject("Scripting.Dictionary")
If Not oInvoicesToCreate.Exists(cInvoiceID) Then
     oInvoicesToCreate(CStr(cInvoiceID)) = ""
End If

Answer 1

var oInvoicesToCreate = {};
if(oInvoicesToCreate[cInvoiceID] === undefined){
    oInvoicesToCreate[cInvoiceID] = "";
}

You probably don’t want to check the hasOwnProperty method because you’ll want to check if anything in the prototype chain has that property as well and not overwrite it. checking with the []s will let you know if any property on any prototype items have the property as well.