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I'm working with a web reporting framework that makes data available through Angular. I can reference a field using Angular in HTML. I would like to do some processing based on a field value and this requires JavaScript. I want to assign the Angular value to a variable in JavaScript but I have no idea how to do this (I'm not a web developer and I know very little about JavaScript and nothing about Angular).

So in my HTML code if I write 

<p>{{FolderDetails[0].RowId}}</p>

the screen will display a value e.g. 12345

I tried the following in my HTML code but nothing displays
 

<script>   
  document.write('Hello World!');   
  
  //Get the value from Angular and assign to a JavaScript variable  
  var RowId = {{FolderDetails[0].RowId}};  
  
  document.write('RowId = ' + RowId);

</script>

Thanks in advance.