Playing with console

console.js

// Will print... [2016-11-09T07:52:09.303Z] foo bar
// ES6
var _log = _log || console.log;
console.log = (...arguments) => {
  arguments.unshift(`[${new Date().toISOString()}]`)
  _log.apply(console, arguments);
};
console.log('foo', 'bar');

// ES5
var _log = _log || console.log;
console.log = function() {
  const args = Array.prototype.slice.call(arguments);
  args.unshift(`[${new Date().toISOString()}]`)
  _log.apply(console, args);
};
console.log('foo', 'bar');