Split Test

components.page-split\.js

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

export default Component.extend({
  orderItems: [
    { name: 'glen' },
    { name: 'sean' },
    { name: 'nitzan'}
  ],
  
  wrappedOrderItems: [],

  splitItems: computed('wrappedOrderItems.@each.isSplit', function() {
    return this.wrappedOrderItems.filterBy('isSplit');
  }),
  
  currentItems: computed('wrappedOrderItems.@each.isSplit', function() {
    return this.wrappedOrderItems.rejectBy('isSplit');
  }),
  
  // wrap the original in a new object b/c we don't want to modify our order-item model
  didInsertElement() {
    const wrappedOrderItems = this.orderItems.map(oi => {
      return EmberObject.create({ 
        orderItem: oi,
        isSplit: false
      });
    });   
    this.set('wrappedOrderItems', wrappedOrderItems);
  },
  
  doSplit: action(function(item) {
    item.set('isSplit', !item.isSplit);
  })
  
});

controllers.application\.js

import Controller from '@ember/controller';

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

templates.application\.hbs

<Page-Split />

templates.components.page-split\.hbs

<h1>first</h1>
<ul>
{{#each currentItems as |item|}}
	<div {{on "click" (fn this.doSplit item)}}>
  	{{item.orderItem.name}}
   </div>
{{/each}}
</ul>

<h1>Second</h1>
<ul>
{{#each splitItems as |item|}}
	<div {{on "click" (fn this.doSplit item)}}>
  	{{item.orderItem.name}}
   </div>
{{/each}}
</ul>

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"
  }
}