Vue 3 computed

Vue 3 composition api watch

// directly watching a ref

const selected = ref(props.selected)

watch(selected, (selection, prevSelection) => { 
   /* ... */ 
})

Source: stackoverflow.com

Vue computed

var vm = new Vue({
  el: '#example',
  data: {
    message: 'Hello'
  },
  computed: {
    // a computed getter
    reversedMessage: function () {
      // `this` points to the vm instance
      return this.message.split('').reverse().join('')
    }
  }
})

Vue 3 computed

const count = ref(1)
const plusOne = computed(() => count.value + 1)

console.log(plusOne.value) // 2

plusOne.value++ // error
1

Source: v3.vuejs.org

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