code: function camelCase(str) {
    var capitaliseLead = arguments.length <= 1 || arguments[1] === undefined ? false : arguments[1];
  
    str = str.replace(/_([a-z])/g, function (group) {
      if (group[1]) {
        return group[1].toUpperCase();
      }
    });
    if (capitaliseLead) {
      return str.charAt(0).toUpperCase() + str.slice(1);
    } else {
      return str;
    }
  }
docs: CamelCase
  @param  {String} str String with "under_score"
  @return {String} UnderScore is now CamelCased