Counter

counter.markdown

Counter

A Pen by Hyperapp on CodePen.

License.

script.babel

const { h, app } = hyperapp
// @jsx h 

const state = {
  count: 0
}

const actions = {
  down: value => state => ({ count: state.count - value }),
  up: value => state => ({ count: state.count + value })
}

const view = (state, actions) => (
  <main>
    <h1>{state.count}</h1>
    <button onclick={() => actions.down(1)} disabled={state.count <= 0}>ー</button>
    <button onclick={() => actions.up(1)}>＋</button>
  </main>
)

app(state, actions, view, document.body)

scripts

<script src="https://unpkg.com/hyperapp"></script>

style.scss

body {
  align-items: center;
  background-color: #111;
  display: flex;
  font-family: Helvetica Neue, sans-serif;
  height: 100vh;
  justify-content: center;
  margin: 0;
  padding: 0;
  line-height: 1;
  text-align: center;
  color: #00caff;
}
h1 {
  color: inherit;
  font-weight: 100;
  font-size: 8em;
  margin: 0;
  padding-bottom: 15px;
}
button {
  background: #111;
  border-radius: 0px;
  border: 1px solid #00caff;
  color: inherit;
  font-size: 2em;
  font-weight: 100;
  line-height: inherit;
  margin: 0;
  outline: none;
  padding: 5px 15px 10px;
  transition: background .2s;
}
button:hover,
button:active,
button:disabled {
  background: #00caff;
  color: #111;
}
button:active {
  outline: 2px solid #00caff;
}
button:focus {
  border: 1px solid #00caff;
}
button + button {
  margin-left: 3px;
}