hash

components.hash-example\.hbs

<p>Same? {{this.isEq}}</p>
<p>(rendered: @foo.a = "{{@foo.a}}", @foo.b = "{{@foo.b}}")</p>

components.hash-example\.js

import Component from '@glimmer/component';

export default class HashExample extends Component {
  prev = null;

  get isEq() {
    if (this.prev == null) {
      this.prev = this.args.foo;
      return "need to set a value: nothing to compare initially";
    }

    return this.prev === this.args.foo;
  }
}

controllers.application\.js

import Controller from '@ember/controller';
import { tracked } from '@glimmer/tracking';

export default class ApplicationController extends Controller {
  @tracked a = '';
  @tracked b = '';

  set = (key, { target: { value } }) => {
    this[key] = value;
  }
}

templates.application\.hbs

<HashExample @foo={{hash a=this.a b=this.b}} />

<label>a (currently "{{this.a}}"): <input value={{this.a}} {{on "input" (fn this.set "a")}} /></label>
<label>b (currently "{{this.b}}"): <input value={{this.b}} {{on "input" (fn this.set "b")}} /></label>

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"
  }
}