Get data from list

I have created an html code that sends data to app inventor:

   var dataArrayyy = ["", "", "", ""];

   function chancestringwebview(varde, index) {
     dataArrayyy[index] = varde;

   chancestringwebview("s", 2)

But I can't get the data from the index in the list, what should I do? I have tried several different ways. The list will come to MIT like ["","","s",""]. Anyone have any ideas?

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