Created
February 11, 2018 02:06
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Simple React Counter
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| const counter = (state = 0, action) => { | |
| switch (action.type) { | |
| case 'INCREMENT': | |
| return state += 1; | |
| case 'DECREMENT': | |
| return state -= 1; | |
| default: | |
| return state; | |
| } | |
| } | |
| const Counter = ({value, onIncrement, onDecrement}) => ( | |
| <div> | |
| <h1>{value}</h1> | |
| <button onClick={onIncrement}>+</button> | |
| <button onClick={onDecrement}>-</button> | |
| </div> | |
| ); | |
| const { createStore } = Redux; | |
| const store = createStore(counter); | |
| const render = () => { | |
| ReactDOM.render( | |
| <Counter | |
| value={store.getState()} | |
| onIncrement={() => store.dispatch({type: 'INCREMENT'})} | |
| onDecrement={() => store.dispatch({type: 'DECREMENT'})} | |
| />, | |
| document.getElementById('app') | |
| ); | |
| }; | |
| store.subscribe(render); | |
| render(); | |
| // a few test to be used with expect.js | |
| // expect( | |
| // counter(0, { type: 'TEST' }) | |
| // ).toEqual(0); | |
| // expect( | |
| // counter(0, { type: 'INCREMENT' }) | |
| // ).toEqual(1); | |
| // expect( | |
| // counter(1, { type: 'DECREMENT' }) | |
| // ).toEqual(0); | |
| // console.log('Tests passed'); |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width"> | |
| <title>JS Bin</title> | |
| <script src="https://fb.me/react-15.1.0.js"></script> | |
| <script src="https://fb.me/react-dom-15.1.0.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/redux/3.7.2/redux.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/expect/1.20.2/expect.js"></script> | |
| </head> | |
| <body> | |
| <div id="app"></div> | |
| </body> | |
| </html> |
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