examples/counter.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="x-ua-compatible" content="ie=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="shortcut icon" type="image/x-icon" href="../favicon.ico">
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/water.css@2/out/water.css">
    <title>Counter - Ring</title>
  </head>
  <body>
    <h1><img src="../favicon.ico"> Counter: <span></span></h1>
    <button value="-1">-</button>
    <button value="1">+</button>
    <script type="module">
      import ring from "../index.js"

      ring({
        init: 0,
        register: (update, dispatch) => ({
          init: () => {
            document.body.querySelectorAll('button').forEach(btn => {
              btn.addEventListener('click', ev => {
                dispatch('change', parseInt(ev.target.value))
              })
            })
          },
          change: delta => {
            update(count => count + delta)
          } 
        }),
        view: (count) => {
          document.body.querySelector('span').textContent = count
        }
      })
    </script>
  </body>
</html>