Computed Property test

controllers.application.js

import Ember from 'ember';
const DefineCP = function(context, cpName, dependantKey, model){
    context.set("model", model);
    Ember.defineProperty(context, cpName, Ember.computed(dependantKey, function(){
        return context.get(dependantKey);
    }));
};

const DonutChart = Ember.Object.extend({
    reinit(){
        this.set("value", [2]);
        return this;
    },
    data: Ember.computed("value.[]", function(){
        if(this.value)
            return this.value.reduce((a,b)=>{ return a+b; });
    }),
    setData(value){
        let model = Ember.Object.create({ value });
        DefineCP(this, "value","model.value", model);
        // this.set("value", value);
        return this;
    }
});
export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  init(){
        this._super(...arguments);   
        this.donut = DonutChart.create().reinit();
    },
    actions:{
        update(){
            let data = [10, 20, 11];
            this.donut.setData(data);
        }
    }
});

templates.application.hbs

<button {{action "update"}}>Update</button>
{{donut.data}} {{donut.total}} {{donut.value}}

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "2.14.1",
    "ember-template-compiler": "2.14.1",
    "ember-testing": "2.14.1"
  },
  "addons": {
    "ember-data": "2.14.10"
  }
}