Created
May 26, 2017 09:47
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JS Bin // source https://jsbin.com/bobitif
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta name="description" content="javascript-redux-avoiding-object-mutations-with-object-assign-and-spread"> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width"> | |
| <script src="https://unpkg.com/expect/umd/expect.min.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/redux/3.6.0/redux.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/freezer-js/0.12.1/freezer.js"></script> | |
| <script src="https://fb.me/react-15.1.0.js"></script> | |
| <script src="https://fb.me/react-dom-15.1.0.js"></script> | |
| <title>JS Bin</title> | |
| </head> | |
| <body> | |
| <div id="root"></div> | |
| <script id="jsbin-javascript"> | |
| // javascript-redux-avoiding-object-mutations-with-object-assign-and-spread | |
| '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 toggleTodo = function toggleTodo(todo) { | |
| return _extends({}, todo, { | |
| completed: !todo.completed | |
| }); | |
| // return Object.assign({},todo, | |
| // {completed: !todo.completed}) | |
| }; | |
| var testToggleTodo = function testToggleTodo() { | |
| var todoBefore = { | |
| id: 0, | |
| text: 'Learn Redux', | |
| completed: false | |
| }; | |
| var todoAfter = { | |
| id: 0, | |
| text: 'Learn Redux', | |
| completed: true | |
| }; | |
| Object.freeze(todoBefore); | |
| expect(toggleTodo(todoBefore)).toEqual(todoAfter); | |
| }; | |
| testToggleTodo(); | |
| console.log('Tests Ok!'); | |
| </script> | |
| <script id="jsbin-source-javascript" type="text/javascript">// javascript-redux-avoiding-object-mutations-with-object-assign-and-spread | |
| const toggleTodo = (todo) => { | |
| return { | |
| ...todo, | |
| completed: !todo.completed | |
| }; | |
| // return Object.assign({},todo, | |
| // {completed: !todo.completed}) | |
| }; | |
| const testToggleTodo = () => { | |
| const todoBefore = { | |
| id: 0, | |
| text: 'Learn Redux', | |
| completed: false | |
| }; | |
| const todoAfter = { | |
| id: 0, | |
| text: 'Learn Redux', | |
| completed: true | |
| }; | |
| Object.freeze(todoBefore); | |
| expect( | |
| toggleTodo(todoBefore) | |
| ).toEqual(todoAfter); | |
| }; | |
| testToggleTodo(); | |
| console.log('Tests Ok!') | |
| </script></body> | |
| </html> |
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| // javascript-redux-avoiding-object-mutations-with-object-assign-and-spread | |
| '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 toggleTodo = function toggleTodo(todo) { | |
| return _extends({}, todo, { | |
| completed: !todo.completed | |
| }); | |
| // return Object.assign({},todo, | |
| // {completed: !todo.completed}) | |
| }; | |
| var testToggleTodo = function testToggleTodo() { | |
| var todoBefore = { | |
| id: 0, | |
| text: 'Learn Redux', | |
| completed: false | |
| }; | |
| var todoAfter = { | |
| id: 0, | |
| text: 'Learn Redux', | |
| completed: true | |
| }; | |
| Object.freeze(todoBefore); | |
| expect(toggleTodo(todoBefore)).toEqual(todoAfter); | |
| }; | |
| testToggleTodo(); | |
| console.log('Tests Ok!'); |
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