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<!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: 'Brielle'
};

var newPerson = _extends({}, person, {
  age: 2
});

console.log(newPerson);

var filterNums = function filterNums() {
  for (var _len = arguments.length, args = Array(_len), _key = 0; _key < _len; _key++) {
    args[_key] = arguments[_key];
  }

  return args.filter(function (el) {
    return el === 1;
  });
};

console.log(filterNums(1, 2, 3));
</script>


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

console.log(newNumbers);

const person = {
  name: 'Brielle'
};

const newPerson = {
  ...person,
  age: 2
}

console.log(newPerson);

const filterNums = (...args) => {
  return args.filter(el => el === 1);
}

console.log(filterNums(1, 2, 3));</script></body>
</html>