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<!DOCTYPE html>
<html>
<head>
  <meta name="description" content="[counter app built with redux]">
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
  <script src="https://unpkg.com/redux@latest/dist/redux.min.js"></script>
</head>
<body>
  <h1 id="counter"></h1>
  <button id="inc">+</button>
  <button id="dec">-</button>
  
  <script>
    // define reducer
    const reducer = (state = 0, action) => {
      switch (action.type) {
        case 'INCREMENT':
          return state + 1;
        case 'DECREMENT':
          return state - 1;
        default:
          return state;
      }
    }
    
    // create store
    const store = Redux.createStore(reducer);
    
    // select DOM objects to work with
    const counterElt = document.getElementById('counter');
    const incButton = document.getElementById('inc');
    const decButton = document.getElementById('dec');
    
    // dispatch actions on buttons click
    incButton.addEventListener('click', () => {
      store.dispatch({ type: 'INCREMENT' });
    });
    decButton.addEventListener('click', () => {
      store.dispatch({ type: 'DECREMENT' });
    })
    
    // function to update DOM with new state from store
    const render = () => {
      counterElt.innerHTML = store.getState();
    }
    
    render(); // render intial state
    store.subscribe(render); // re-render every time store updates
    
    // TODO: reset counter button
    // TODO: multiple counters
  </script>
​
</body>
</html>
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buyfnpro
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