Google Apps Script to turn Twitter usernames into links

twitterlinks.js

function makeLinks() {
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var twitterDataRange = ss.getRangeByName("Twitter3");
  vals = twitterDataRange.getValues();
  
  for (i in vals) {
    var row = vals[i];  
    for (j in row) {
      var col = vals[i][j];
      vals[i][j] = makeLink(col);
    }
  }
  twitterDataRange.setFormulas(vals);
}

function makeLink(cellContent) {
  if (cellContent[0] == '@') {
    var url = "http://twitter.com/" + cellContent.substr(1);
    var newContent = "=HYPERLINK(\"" + url+ "\",\"" + cellContent + "\")";
    return newContent;
  } else {
    return cellContent; 
  }
}