query params array

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  init(){
    this._super(...arguments);
    this.set('queryParams', [{
        state: { type: 'array'}
    }])
    this.set('statesArray', [1,2,3]);
  },
  appName: 'Ember Twiddle'
});

templates.application.hbs

{{#each state as |s|}}
  {{s}}
  <br>
{{/each}}

{{#link-to 'index' (query-params state=statesArray)}}Go to route with query params{{/link-to}}

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"
  }
}