New Twiddle

components.tracked-array\.js

import Component from '@glimmer/component';
import { tracked} from '@glimmer/tracking';
import { later } from '@ember/runloop';
export default class extends Component {
  @tracked
  trackedArray = [];

  current = 0;
	constructor(){
    super(...arguments);
    this.doPoll();
  }
	
	doPoll() {
    this.trackedArray = [...this.trackedArray, this.current];
    this.current = this.current + 1;
    
    later(this, this.doPoll, 2000);
  }
}

controllers.application\.js

import Controller from '@ember/controller';

export default class ApplicationController extends Controller {
  appName = 'Ember Twiddle';
}

routes.application\.js

import Route from '@ember/routing/route';
import { later } from '@ember/runloop';
import { A } from '@ember/array';

export default class ApplicationRoute extends Route{
	recent = A([]);
	current = 0;

  init() {
    super.init(...arguments);
    this.getRecent();
  }

  getRecent() {
    // poll data / fetch latest
    this.recent.pushObject(this.current);
    this.current = this.current + 1;
    
    later(this, this.getRecent, 2000);
  }

  model() {
    return this.recent;
  }
}

templates.application\.hbs

this.recent: [{{#each this.model as |val|}}{{val}} {{/each}}]
<br>
tracked array: <TrackedArray/>

templates.components.tracked-array\.hbs

[{{#each this.trackedArray as |val|}}{{val}} {{/each}}]

twiddle\.json

{
  "version": "0.17.1",
  "EmberENV": {
    "FEATURES": {},
    "_TEMPLATE_ONLY_GLIMMER_COMPONENTS": false,
    "_APPLICATION_TEMPLATE_WRAPPER": true,
    "_JQUERY_INTEGRATION": true
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.js",
    "ember": "3.18.1",
    "ember-template-compiler": "3.18.1",
    "ember-testing": "3.18.1"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}