code: function(key) {
      if (!key.match(suffixRegex)) {
        return key + '2';
      }
  
      return key.replace(suffixRegex, function(suffix) {
        return Number(suffix) + 1;
      });
    }
docs: Iterate the given key to make it unique.
  
  @param {String} key
  Modify the component key to be unique.
  
  @returns {String}
  The new component key.