Untitled

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>

<script id="jsbin-javascript">
'use strict';

var _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; };

var numbers = [1, 2, 3];
var newNumbers = [].concat(numbers, [4]);

console.log(newNumbers);

var person = {
  name: 'Max'
};

var newPerson = _extends({}, person, {
  age: 57
});

console.log(newPerson);
</script>


<script id="jsbin-source-javascript" type="text/javascript">const numbers = [1, 2, 3];
const newNumbers = [...numbers, 4];

console.log(newNumbers);

const person = {
  name: 'Max'
};

const newPerson = {
  ...person,
  age:57
};

console.log(newPerson);</script></body>
</html>