Unique Array

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  simpleYears: Ember.computed('newsletters', function() {
    const years = [2015, 2015, 2015]
    console.log(years)
    return years
      .map(item => item)
    	.uniq()
  }),
  years: Ember.computed('newsletters', function() {
    return this.get('newsletters')
    	.map(item => item.Year)
    	.uniq()
  }),
  newsletters: [
	{
	"id": 0,
	"Year": 2016,
	"ImageSource": "/files/M965-115A-Q3%20AF%20Newsletter_Quarter_3_450%20X%20582_tcm39-118170.jpg",
	"Link": "/files/M965-115A-Q3%20AF%20Newsletter_Quarter_3_tcm39-118171.pdf",
	"Summary": "This edition of the Active&Fit® newsletter illustrates how “intrinsic motivators” can help you meet your goals, details why rowing ranks as one of the best exercises, offers tips to cope with workout burnout, and goes over new cholesterol guidelines.",
	"Title": "Active&Fit Newsletter Volume 7, Issue 3"
	},
	{
	"id": 0,
	"Year": 2016,
	"ImageSource": "/files/M965-115A-Q3%20AF%20Newsletter_Quarter_3_450%20X%20582_tcm39-118170.jpg",
	"Link": "/files/M965-115A-Q3%20AF%20Newsletter_Quarter_3_tcm39-118171.pdf",
	"Summary": "This edition of the Active&Fit® newsletter illustrates how “intrinsic motivators” can help you meet your goals, details why rowing ranks as one of the best exercises, offers tips to cope with workout burnout, and goes over new cholesterol guidelines.",
	"Title": "Active&Fit Newsletter Volume 7, Issue 3"
	},
	{
	"id": 0,
	"Year": 2016,
	"ImageSource": "/files/M965-115A-Q3%20AF%20Newsletter_Quarter_3_450%20X%20582_tcm39-118170.jpg",
	"Link": "/files/M965-115A-Q3%20AF%20Newsletter_Quarter_3_tcm39-118171.pdf",
	"Summary": "This edition of the Active&Fit® newsletter illustrates how “intrinsic motivators” can help you meet your goals, details why rowing ranks as one of the best exercises, offers tips to cope with workout burnout, and goes over new cholesterol guidelines.",
	"Title": "Active&Fit Newsletter Volume 7, Issue 3"
	}
  ]
});

templates.application.hbs

<h1>Unique arrays</h1>
<br>
<h3>Simple Years</h3>
{{#each simpleYears as |year|}}
  {{year}}
{{/each}}

<h3>Property Years</h3>
{{#each years as |year|}}
  {{year}}
{{/each}}
<br>

twiddle.json

{
  "version": "0.13.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.16.2",
    "ember-template-compiler": "2.16.2",
    "ember-testing": "2.16.2"
  },
  "addons": {
    "ember-data": "2.16.3"
  }
}