New Twiddle

components.paginated-list.js

import Ember from 'ember';
import { get, set } from '@ember/object';

export default Ember.Component.extend({
  perPage: 2,
  pageNumber: 1,
  
  paginatedData: Ember.computed('data.[]', 'perPage', 'pageNumber', function() {
    let { data, perPage, pageNumber } = this.getProperties('data', 'perPage', 'pageNumber');
    
    return data.slice(0, perPage * pageNumber);
  }),
  
  actions: {
    loadMore() {
      let pageNumber = get(this, 'pageNumber');
      let newPageNumber = pageNumber + 1;
      
      set(this, 'pageNumber', newPageNumber);
    }
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  numbers: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20]
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>

{{outlet}}

{{paginated-list data=numbers}}

templates.components.paginated-list.hbs

{{#each paginatedData as |datum|}}
	<p>{{datum}}</p>
{{/each}}

<button {{action "loadMore"}}>Load Moar</button>

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": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}