Vue

by Damian Dulisz

HTML

<div id="app">
  <h2>My Comp:</h2>
  <div v-once>
    y = {{ y }} (this won’t rerender)
    <hr>
    Child can update itself am:
    <my-comp :y="y" />
  </div>
  
  <hr>
  <button @click="y.value++">
    y++ {{ y }}
  </button>
</div>

CSS

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#app {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  transition: all 0.2s;
}

li {
  margin: 8px 0;
}

h2 {
  font-weight: bold;
  margin-bottom: 15px;
}

del {
  color: rgba(0, 0, 0, 0.3);
}

Vue

const MyComp = {
  props: { y: Object },
  data () {
    return {
      x: 0
    }
  },
  render (h) {
    return h('div', {}, [
      h('button', { on: { click: () => this.x++ } }, `x = ${this.x }`),
      `x + y = ${this.x + this.y.value}`
    ])
  }
}

new Vue({
  components: { 'my-comp': MyComp },
  el: "#app",
  data: {
    y: { value: 0 },
  },
})