var events = [
  'touchstart',
  'touchend',
  'mousedown',
  'mouseup',
  'selectionchange',
  'selectionchanged',
  'selectstart',
];

var counts = events.reduce(function (counts, name) {
  counts[name] = 0;
  return counts;
}, {});

events.forEach(function (name) {
  document.addEventListener(name, function () {
    ++counts[name];
    console.log('%s triggered. count: %d', name, counts[name]);
  });
});