Ember Reject

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  petWalruses: [
    {name: "Frank"},
    {name: ""},
    {name: "Jean"},
    {name: "Shirley"}
  ],
  walrusNames: Ember.computed("petWalruses", function() {
    const walrusesWithNames = this.get("petWalruses").reject(function(walrus) {
      return !Ember.isBlank(walrus.name);
    });
    return walrusesWithNames.mapBy("name");
  })
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>
<h2>These are our pet walruses who have names</h2>
<ul>
  {{#each walrusNames as |name|}}
  	<li>{{name}}</li>
  {{/each}}
</ul>

twiddle.json

{
  "version": "0.7.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.3/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.4.3/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.3/ember-template-compiler.js"
  }
}