LinkedLists

controllers.application\.js

import Controller from '@ember/controller';
import LinkedList from '../linked-list';

export default class ApplicationController extends Controller {
  appName = 'Ember Twiddle';
  data = LinkedList.create();
}

linked-list\.js

import ArrayProxy from '@ember/array/proxy';
import { tracked } from '@glimmer/tracking';
import { A } from '@ember/array';

const Page1 = {
  links: {},
  meta: {},
  data: [
    {
      type: 'post',
      id: '1',
      attributes: {
        title: 'A spiffy title 1', 
      }
    }
  ]
}
const Page2 = {
  links: {},
  meta: {},
  data: [
    {
      type: 'post',
      id: '2',
      attributes: {
        title: 'A spiffy title 2', 
      }
    }
  ]
}
const Page3 = {
  links: {},
  meta: {},
  data: [
    {
      type: 'post',
      id: '3',
      attributes: {
        title: 'A spiffy title 3', 
      }
    }
  ]
}

class Resource {
  constructor(data) {
    this.id = data.id;
    this.type = data.type;
    Object.assign(this, data.attributes);
  }
}

class Collection {
  @tracked links;
  @tracked meta;
  @tracked data;
  
  constructor({ links, meta, data }) {
    this.links = links;
    this.meta = meta;
    this.data = A(data.map(d => new Resource(d)));
  }
}

const pagesForCollection = A([
  new Collection(Page1),
  new Collection(Page2),
  new Collection(Page3),
]);

export default class PaginatedCollection extends ArrayProxy {
  @tracked pages = pagesForCollection;

	get length() {
  	return this.pages.reduce((count, page) => { return count + page.data.length; }, 0);
  }
  
  objectAt(index) {
    const { pages } = this;
    let counted = 0;
    
  	for (let i = 0; i < pages.length; i++) {
      let startCount = counted;
      counted += pages[i].data.length;
      if (index < counted) {
         return pages[i].data[index - startCount];
      }
    }
    return undefined;
  }
}

templates.application\.hbs

<h1>Welcome to {{this.appName}}</h1>
<br>
<ul>
  {{#each this.data as |item index|}}
    <li>{{item.title}}</li>
  {{/each}}
</ul>

<br>
{{outlet}}
<br>
<br>

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"
  }
}