Remove named range duplicates

removeDuplicateRanges.gs

function removeDuplicateRanges() {
  while (true) {
    var doc = DocumentApp.getActiveDocument();
    var nameToRanges = {}
    doc.getNamedRanges().forEach(function(namedRange) {
      if (nameToRanges[namedRange.getName()]) {
        nameToRanges[namedRange.getName()].push(namedRange)
      } else {
        nameToRanges[namedRange.getName()] = [namedRange]
      }
    });
    var removedRanges = 0
    for (var name in nameToRanges) {
      for (var i = 0; i < nameToRanges[name].length-1; i++) {
        nameToRanges[name][i].remove();
        removedRanges++;
      }
      if (removedRanges > 5) break;
    }
    if (!removedRanges) {
      break;
    } else {
      doc.saveAndClose();
    }
  }
}