composition api code example

Example 1: vue composition api

<template>
  <button @click="increment">
    Count is: {{ state.count }}, double is: {{ state.double }}
  </button>
</template>

<script>
import { reactive, computed } from 'vue'

export default {
  setup() {
    const state = reactive({
      count: 0,
      double: computed(() => state.count * 2)
    })

    function increment() {
      state.count++
    }

    return {
      state,
      increment
    }
  }
}
</script>

Example 2: store composition api

import { computed } from 'vue'
import { useStore } from 'vuex'

export default {
  setup () {
    const store = useStore()

    return {
      // access a state in computed function
      count: computed(() => store.state.count),

      // access a getter in computed function
      double: computed(() => store.getters.double)
    }
  }
}