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let brackets = {
  "[": "]",
  "{": "}",
  "(": ")",
  "<": ">"
}

function correctBrackets (str) {
  const vals = Object.keys(brackets).map(key => brackets[key]);
  const keys = Object.keys(brackets);

z4o4z

"use strict";

var events = Symbol("events");

function MyObserver () {
	this[events] = {};
}

MyObserver.prototype = {};

z4o4z

function doubleNum (number) {
  var string = number.toString();
  var length = string.length;
  var left = string.substr(0, length / 2);
  var right = string.substr(length / 2, length);
  
  if (left === right) { return number; }
  
  return number * 2;
}