sebabouche/index.html

## index.html
<!DOCTYPE html>
<html>
<head>
<meta name="description" content="Writing a Todo List Reducer">
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <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">
'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); } }

console.clear();
console.log('Running...');

var todos = function todos(state, action) {
  if (state === undefined) state = [];

  switch (action.type) {
    case 'ADD_TODO':
      return [].concat(_toConsumableArray(state), [{
        id: action.id,
        text: action.text,
        completed: false
      }]);
    default:
      return state;
  }
};

var testAddTodo = function testAddTodo() {
  var stateBefore = [];
  var action = {
    type: 'ADD_TODO',
    id: 0,
    text: 'Learn Redux'
  };
  var stateAfter = [{
    id: 0,
    text: 'Learn Redux',
    completed: false
  }];

  deepFreeze(stateBefore);
  deepFreeze(action);

  expect(todos(stateBefore, action)).toEqual(stateAfter);
};

testAddTodo();
console.log('Passed');
</script>


<script id="jsbin-source-javascript" type="text/javascript">console.clear()
console.log('Running...')

const todos = (state = [], action) => {
  switch(action.type) {
    case 'ADD_TODO':
      return [
        ...state,
        {
          id: action.id,
          text: action.text,
          completed: false
        }
      ]
    default:
      return state
  }
}

const testAddTodo = () => {
  const stateBefore = []
  const action = {
    type: 'ADD_TODO',
    id: 0,
    text: 'Learn Redux'
  }
  const stateAfter = [
    {
      id: 0,
      text: 'Learn Redux',
      completed: false
    }
  ]

  deepFreeze(stateBefore)
  deepFreeze(action)

  expect(
    todos(stateBefore, action)
  ).toEqual(stateAfter)
}

testAddTodo()
console.log('Passed')</script></body>
</html>

## jsbin.rikozel.js
'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); } }

console.clear();
console.log('Running...');

var todos = function todos(state, action) {
  if (state === undefined) state = [];

  switch (action.type) {
    case 'ADD_TODO':
      return [].concat(_toConsumableArray(state), [{
        id: action.id,
        text: action.text,
        completed: false
      }]);
    default:
      return state;
  }
};

var testAddTodo = function testAddTodo() {
  var stateBefore = [];
  var action = {
    type: 'ADD_TODO',
    id: 0,
    text: 'Learn Redux'
  };
  var stateAfter = [{
    id: 0,
    text: 'Learn Redux',
    completed: false
  }];

  deepFreeze(stateBefore);
  deepFreeze(action);

  expect(todos(stateBefore, action)).toEqual(stateAfter);
};

testAddTodo();
console.log('Passed');
	<!DOCTYPE html>
	<html>
	<head>
	<meta name="description" content="Writing a Todo List Reducer">
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width">
	<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">
	'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); } }

	console.clear();
	console.log('Running...');

	var todos = function todos(state, action) {
	if (state === undefined) state = [];

	switch (action.type) {
	case 'ADD_TODO':
	return [].concat(_toConsumableArray(state), [{
	id: action.id,
	text: action.text,
	completed: false
	}]);
	default:
	return state;
	}
	};

	var testAddTodo = function testAddTodo() {
	var stateBefore = [];
	var action = {
	type: 'ADD_TODO',
	id: 0,
	text: 'Learn Redux'
	};
	var stateAfter = [{
	id: 0,
	text: 'Learn Redux',
	completed: false
	}];

	deepFreeze(stateBefore);
	deepFreeze(action);

	expect(todos(stateBefore, action)).toEqual(stateAfter);
	};

	testAddTodo();
	console.log('Passed');
	</script>



	<script id="jsbin-source-javascript" type="text/javascript">console.clear()
	console.log('Running...')

	const todos = (state = [], action) => {
	switch(action.type) {
	case 'ADD_TODO':
	return [
	...state,
	{
	id: action.id,
	text: action.text,
	completed: false
	}
	]
	default:
	return state
	}
	}

	const testAddTodo = () => {
	const stateBefore = []
	const action = {
	type: 'ADD_TODO',
	id: 0,
	text: 'Learn Redux'
	}
	const stateAfter = [
	{
	id: 0,
	text: 'Learn Redux',
	completed: false
	}
	]

	deepFreeze(stateBefore)
	deepFreeze(action)

	expect(
	todos(stateBefore, action)
	).toEqual(stateAfter)
	}

	testAddTodo()
	console.log('Passed')</script></body>
	</html>