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Codecademy export
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<!DOCTYPE html> | |
<html lang="en"> | |
<head> | |
<meta charset="utf-8"> | |
<link rel="stylesheet" href="./index.css"> | |
<title>Learn ReactJS</title> | |
</head> | |
<body> | |
<main id="app"> | |
<p id='counter'>Waiting for current state.</p> | |
<button id='incrementer'>+</button> | |
<button id='decrementer'>-</button> | |
</main> | |
</body> | |
<!-- Do Not Remove --> | |
<script src="https://content.codecademy.com/courses/React/react-16-redux-4-bundle.min.js"></script> | |
<script src="https://cdnjs.cloudflare.com/ajax/libs/redux/4.0.5/redux.min.js" integrity="sha512-P36ourTueX/PrXrD4Auc1kVLoTE7bkWrIrkaM0IG2X3Fd90LFgTRogpZzNBssay0XOXhrIgudf4wFeftdsPDiQ==" crossorigin="anonymous"></script> | |
<script src="./store.js"></script> | |
</html> |
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/* Note to learners: | |
Normally, you would import redux like this: | |
import { createStore } from 'redux'; | |
Due to Codecademy's technical limitations | |
for testing this exercise, we are using | |
`require()`. | |
*/ | |
const { createStore } = require('redux'); | |
// Action Creators | |
function increment() { | |
return {type: 'increment'} | |
} | |
function decrement() { | |
return {type: 'decrement'} | |
} | |
// Reducer / Store | |
const initialState = 0; | |
const countReducer = (state = initialState, action) => { | |
switch (action.type) { | |
case 'increment': | |
return state + 1; | |
case 'decrement': | |
return state - 1; | |
default: | |
return state; | |
} | |
}; | |
const store = createStore(countReducer); | |
// HTML Elements | |
const counterElement = document.getElementById('counter'); | |
const incrementer = document.getElementById('incrementer'); | |
const decrementer = document.getElementById('decrementer'); | |
// Store State Change Listener | |
const render = () => { | |
counterElement.innerHTML = store.getState(); | |
} | |
store.subscribe(render); | |
render(); | |
// DOM Event Handlers | |
const incrementerClicked = () => { | |
store.dispatch(increment()); | |
} | |
incrementer.addEventListener('click', incrementerClicked); | |
const decrementerClicked = () => { | |
store.dispatch(decrement()) | |
} | |
decrementer.addEventListener('click', decrementerClicked); | |
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