Answers for "what is computed property in vue js"

vue.js computed property

// ...
computed: {
  fullName: {
    // getter
    get: function () {
      return this.firstName + ' ' + this.lastName
    },
    // setter
    set: function (newValue) {
      var names = newValue.split(' ')
      this.firstName = names[0]
      this.lastName = names[names.length - 1]
    }
  }
}
// ...

vue add watcher

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

what is computed property in vue js

// ...
computed: {
  fullName: {
    // getter
    get: () => {
      return this.firstName + ' ' + this.lastName
    },
    // setter
    set: (newValue) => {
      var names = newValue.split(' ')
      this.firstName = names[0]