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 watch props

new Vue({
  el: '#app',
  data: {
    text: 'Hello'
  },
  components: {
    'child' : {
      template: `<p>{{ myprop }}</p>`,
      props: ['myprop'],
      watch: { 
      	myprop: function(newVal, oldVal) { // watch it
          console.log('Prop changed: ', newVal, ' | was: ', oldVal)
        }
      }
    }
  }
});

Source: stackoverflow.com

Vue add watcher

vm.$watch('person.name.firstName', function(newValue, oldValue) {
	alert('First name changed from ' + oldValue + ' to ' + newValue + '!');
});

Source: codingexplained.com

Similar codes

0 vote214 views1 answer
How to pass a parameter to Vue @click event handler
Javascript Vue
0 vote226 views1 answer
Use $axios in vuex in nuxt
Javascript Vue
16 votes304 views4 answers
Vue js default prop
Javascript Vue
-2 votes224 views2 answers
Timestamp convert moment vue
Javascript Vue
15 votes290 views6 answers
Vuejs
Javascript Vue
6 votes228 views4 answers
V-for vue
Javascript Vue
4 votes230 views1 answer
How to call action from another module vuex
Javascript Vue
0 vote239 views1 answer
Get the length of an object vuejs
Javascript Vue
0 vote207 views1 answer
Vue toggle boolean on click
Javascript Vue
1 vote223 views1 answer
Vue dynamic create watch
Javascript Vue