ECMAScript 6 - const examples

gistfile1.js

(function () {
  var foo = 'foo';
  const bar = 'bar';
  buzz = 'buzz';

  console.group('Before changes');
  console.info("inital value of foo:", foo);
  console.log("inital value of bar:", bar);
  console.log("inital value of buzz:", buzz);
  console.groupEnd('Before changes');

  foo += buzz;
  bar += buzz;
  buzz = null;

  console.group('After changes');
  console.log("here is foo:", foo);
  console.log("here is bar:", bar);
  console.log("here is buzz:", buzz);
  console.groupEnd('After changes');

  bar = 'foo';
  console.log('Re-assign try: ', bar);

  // const bar = 'foo';
  // console.log('Re-initialize try: ', bar);

  // var bar = 'foo';
  // console.log('Re-declare try: ', bar);

  const sidesEnum = {
    l : 'left',
    r : 'right'
  };

  console.log(sidesEnum.l);
  console.log(sidesEnum.r);

  const fn = function () {
    console.log('This is const function');
    console.log(bar);
    var bar = 'foo';
    console.log("test bar ", bar);
  };
  fn();

  const numberOfMonths = 12;
  const initDate = Date.now();
  console.log(initDate);
  setTimeout(function(){console.log(initDate);}, 2000);

})();