LucasCaixeta/index.html

## index.html
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
  <script src="https://wzrd.in/standalone/expect@latest"></script>
  <script src="https://wzrd.in/standalone/deep-freeze@latest"></script>
</head>
<body>

<script id="jsbin-javascript">
/*
 * Open the console to see
 * that all tests have passed.
 */

'use strict';

function _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = Array(arr.length); i < arr.length; i++) arr2[i] = arr[i]; return arr2; } else { return Array.from(arr); } }

var addCounter = function addCounter(list) {
  return [].concat(_toConsumableArray(list), [0]);
};

var removeCounter = function removeCounter(list, index) {
  return list.filter(function (el, i) {
    return index !== i;
  });
};

var incrementCounter = function incrementCounter(list, index) {
  return list.map(function (item, localIndex) {
    return localIndex === index ? item + 1 : item;
  });
};

var testAddCounter = function testAddCounter() {
  var listBefore = [];
  var listAfter = [0];

  deepFreeze(listBefore);

  expect(addCounter(listBefore)).toEqual(listAfter);
};

var testRemoveCounter = function testRemoveCounter() {
  var listBefore = [0, 10, 20];
  var listAfter = [0, 20];

  deepFreeze(listBefore);

  expect(removeCounter(listBefore, 1)).toEqual(listAfter);
};

var testIncrementCounter = function testIncrementCounter() {
  var listBefore = [0, 10, 20];
  var listAfter = [0, 11, 20];

  deepFreeze(listBefore);

  expect(incrementCounter(listBefore, 1)).toEqual(listAfter);
};

testAddCounter();
testRemoveCounter();
testIncrementCounter();

console.log('All tests passed.');
</script>


<script id="jsbin-source-javascript" type="text/javascript">/*
 * Open the console to see
 * that all tests have passed.
 */

const addCounter = (list) => {
  return [...list, 0];
};

const removeCounter = (list, index) => {
  return list.filter((el, i)=> index !==i);
};

const incrementCounter = (list, index) => {
  return list.map((item, localIndex) =>  localIndex === index ? item + 1  : item)
};

const testAddCounter = () => {
  const listBefore = [];
  const listAfter = [0];

  deepFreeze(listBefore);

  expect(
    addCounter(listBefore)
  ).toEqual(listAfter);
};

const testRemoveCounter = () => {
  const listBefore = [0, 10, 20];
  const listAfter = [0, 20];

  deepFreeze(listBefore);

  expect(
    removeCounter(listBefore, 1)
  ).toEqual(listAfter);
};

const testIncrementCounter = () => {
  const listBefore = [0, 10, 20];
  const listAfter = [0, 11, 20];

  deepFreeze(listBefore);

  expect(
    incrementCounter(listBefore, 1)
  ).toEqual(listAfter);
};

testAddCounter();
testRemoveCounter();
testIncrementCounter();

console.log('All tests passed.');
</script></body>
</html>

## jsbin.qobefifiwe.js
/*
 * Open the console to see
 * that all tests have passed.
 */

'use strict';

function _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = Array(arr.length); i < arr.length; i++) arr2[i] = arr[i]; return arr2; } else { return Array.from(arr); } }

var addCounter = function addCounter(list) {
  return [].concat(_toConsumableArray(list), [0]);
};

var removeCounter = function removeCounter(list, index) {
  return list.filter(function (el, i) {
    return index !== i;
  });
};

var incrementCounter = function incrementCounter(list, index) {
  return list.map(function (item, localIndex) {
    return localIndex === index ? item + 1 : item;
  });
};

var testAddCounter = function testAddCounter() {
  var listBefore = [];
  var listAfter = [0];

  deepFreeze(listBefore);

  expect(addCounter(listBefore)).toEqual(listAfter);
};

var testRemoveCounter = function testRemoveCounter() {
  var listBefore = [0, 10, 20];
  var listAfter = [0, 20];

  deepFreeze(listBefore);

  expect(removeCounter(listBefore, 1)).toEqual(listAfter);
};

var testIncrementCounter = function testIncrementCounter() {
  var listBefore = [0, 10, 20];
  var listAfter = [0, 11, 20];

  deepFreeze(listBefore);

  expect(incrementCounter(listBefore, 1)).toEqual(listAfter);
};

testAddCounter();
testRemoveCounter();
testIncrementCounter();

console.log('All tests passed.');
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<title>JS Bin</title>
	<script src="https://wzrd.in/standalone/expect@latest"></script>
	<script src="https://wzrd.in/standalone/deep-freeze@latest"></script>
	</head>
	<body>

	<script id="jsbin-javascript">
	/*
	* Open the console to see
	* that all tests have passed.
	*/

	'use strict';

	function _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = Array(arr.length); i < arr.length; i++) arr2[i] = arr[i]; return arr2; } else { return Array.from(arr); } }

	var addCounter = function addCounter(list) {
	return [].concat(_toConsumableArray(list), [0]);
	};

	var removeCounter = function removeCounter(list, index) {
	return list.filter(function (el, i) {
	return index !== i;
	});
	};

	var incrementCounter = function incrementCounter(list, index) {
	return list.map(function (item, localIndex) {
	return localIndex === index ? item + 1 : item;
	});
	};

	var testAddCounter = function testAddCounter() {
	var listBefore = [];
	var listAfter = [0];

	deepFreeze(listBefore);

	expect(addCounter(listBefore)).toEqual(listAfter);
	};

	var testRemoveCounter = function testRemoveCounter() {
	var listBefore = [0, 10, 20];
	var listAfter = [0, 20];

	deepFreeze(listBefore);

	expect(removeCounter(listBefore, 1)).toEqual(listAfter);
	};

	var testIncrementCounter = function testIncrementCounter() {
	var listBefore = [0, 10, 20];
	var listAfter = [0, 11, 20];

	deepFreeze(listBefore);

	expect(incrementCounter(listBefore, 1)).toEqual(listAfter);
	};

	testAddCounter();
	testRemoveCounter();
	testIncrementCounter();

	console.log('All tests passed.');
	</script>



	<script id="jsbin-source-javascript" type="text/javascript">/*
	* Open the console to see
	* that all tests have passed.
	*/

	const addCounter = (list) => {
	return [...list, 0];
	};

	const removeCounter = (list, index) => {
	return list.filter((el, i)=> index !==i);
	};

	const incrementCounter = (list, index) => {
	return list.map((item, localIndex) => localIndex === index ? item + 1 : item)
	};

	const testAddCounter = () => {
	const listBefore = [];
	const listAfter = [0];

	deepFreeze(listBefore);

	expect(
	addCounter(listBefore)
	).toEqual(listAfter);
	};

	const testRemoveCounter = () => {
	const listBefore = [0, 10, 20];
	const listAfter = [0, 20];

	deepFreeze(listBefore);

	expect(
	removeCounter(listBefore, 1)
	).toEqual(listAfter);
	};

	const testIncrementCounter = () => {
	const listBefore = [0, 10, 20];
	const listAfter = [0, 11, 20];

	deepFreeze(listBefore);

	expect(
	incrementCounter(listBefore, 1)
	).toEqual(listAfter);
	};

	testAddCounter();
	testRemoveCounter();
	testIncrementCounter();

	console.log('All tests passed.');
	</script></body>
	</html>