CocoRoboDesktop/pdf1.js/node_modules/underscore/amd/uniqueId.js

define(function () {

  // Generate a unique integer id (unique within the entire client session).
  // Useful for temporary DOM ids.
  var idCounter = 0;
  function uniqueId(prefix) {
    var id = ++idCounter + '';
    return prefix ? prefix + id : id;
  }

  return uniqueId;

});