Created
August 24, 2016 20:08
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use Object.assign() and the spread operator proposed for ES7 to avoid mutating objects.
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| const toggleTodo = (todo) => { | |
| return { | |
| ...todo, // ES7 | |
| completed: !todo.completed, | |
| }; | |
| /* ES6 | |
| return Object.assign({}, todo, { | |
| completed: !todo.completed, | |
| }); | |
| */ | |
| }; | |
| const testToggleTodo = () => { | |
| const todoBefore = { | |
| id: 0, | |
| test: 'Learn Redux', | |
| completed: false | |
| }; | |
| const todoAfter = { | |
| id: 0, | |
| test: 'Learn Redux', | |
| completed: true | |
| } | |
| deepFreeze(todoBefore); | |
| expect( | |
| toggleTodo(todoBefore) | |
| ).toEqual(todoAfter); | |
| }; | |
| testToggleTodo(); | |
| console.log('all tests passed'); |
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| <!-- | |
| expect for testing: | |
| <script src="https://wzrd.in/standalone/expect@latest"></script> | |
| deepFreeze for not allowing mutations: | |
| <script src="https://wzrd.in/standalone/deep-freeze@latest"></script> | |
| --> | |
| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <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> | |
| </body> | |
| </html> |
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