Ember/5/Fpe Computed

import EmberObject from '@ember/object';

let Person = EmberObject.extend({
	init() {
		this._super(...arguments);

		this.firstName = 'Betty';
		this.lastName = 'Jones';
	},

	fullName: function () {
		return `${this.firstName} ${this.lastName}`;
	}.property('firstName', 'lastName'),
});

let client = Person.create();

client.get('fullName'); // 'Betty Jones'

client.set('lastName', 'Fuller');
client.get('fullName'); // 'Betty Fuller'

import EmberObject, { computed } from '@ember/object';

let Person = EmberObject.extend({
	init() {
		this._super(...arguments);

		this.firstName = 'Betty';
		this.lastName = 'Jones';
	},

	fullName: computed('firstName', 'lastName', function () {
		return `${this.firstName} ${this.lastName}`;
	}),
});

let client = Person.create();

client.get('fullName'); // 'Betty Jones'

client.set('lastName', 'Fuller');
client.get('fullName'); // 'Betty Fuller'