Component arrays

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  shared: [],
  nonShared: undefined,
  counter: 0,
  
  init() {
    this._super(...arguments);
   	this.set('nonShared', []); 
  },
  
  actions: {
    addShared() {
      let count = this.incrementProperty('counter');
      this.shared.pushObject(`Shared Item ${count}`);
    },
    
    addNonShared() {
      let count = this.incrementProperty('counter');
      this.nonShared.pushObject(`Shared Item ${count}`);
    }
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

templates.application.hbs

{{my-component}}

<hr />

{{my-component}}

templates.components.my-component.hbs

<button onclick={{action 'addShared'}}>Add shared item</button>
<button onclick={{action 'addNonShared'}}>Add non-shared item</button>
Shared:

<ul>
  {{#each this.shared as |item|}}
  <li>{{item}}</li>
  {{/each}}
</ul>

Not Shared:

<ul>
  {{#each this.nonShared as |item|}}
  <li>{{item}}</li>
  {{/each}}
</ul>

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"
  }
}