Using special characters when building a text string in google script

From this thread "Some common VBA functions translated to Google Apps Script" you will find here in Slide 6 that the function Chr(n) in VBA is translated in the javascript:

 function Chr(n) {
  return String.fromCharCode(n);
}

You can also find it in this Github.

For the sample code on how to use this function in AppsScript, check this link.

var map = Maps.newStaticMap();
 for (var i = 0; i < route.legs.length; i++) {
   var leg = route.legs[i];
   if (i == 0) {
     // Add a marker for the start location of the first leg only.
     map.setMarkerStyle(markerSize, markerColor, String.fromCharCode(markerLetterCode));
     map.addMarker(leg.start_location.lat, leg.start_location.lng);
     markerLetterCode++;
   }
   map.setMarkerStyle(markerSize, markerColor, String.fromCharCode(markerLetterCode));
   map.addMarker(leg.end_location.lat, leg.end_location.lng);
   markerLetterCode++;
 }