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

4 votes201 views1 answer
How to call action from another module vuex
Javascript Vue
0 vote200 views1 answer
Vuejs use set to prevent duplicates
Javascript Vue
0 vote202 views1 answer
Vue.runtime.esm.js?2b0e:619 [Vue warn]: Error in nextTick: "RangeError: Maximum call stack size exceeded"
Javascript Vue
2 votes207 views1 answer
Button click redirection to another page vue
Javascript Vue
3 votes199 views1 answer
Vue.js force to reload re-render
Javascript Vue
0 vote205 views1 answer
How add dynamic class in vue.js
Javascript Vue
2 votes211 views2 answers
Vue 3
Javascript Vue
35 votes208 views6 answers
Vue3 cdn
Javascript Vue
0 vote210 views1 answer
Vue js override component css
Javascript Vue
8 votes201 views3 answers
Vue redirect to route
Javascript Vue