stackoverflow question #42991410 solution

components.table-x-row.js

import Ember from 'ember';

export default Ember.Component.extend({
});

components.table-x.js

import Ember from 'ember';
let data = ['value1', 'value2', 'value3', 'value4'];

export default Ember.Component.extend({
  init() {
    this._super(...arguments);
    this.set('selected', []);
    this.set('rows', data);
  },
  
  rowsWithSelectionInfo: Ember.computed('rows.[]', function(){
    let result = [];
    for (let row of this.get('rows')) {
      result.pushObject({row: row, isSelected: false});
    }
    
    return result;
  }),
  
  actions: {
    addtoselected() {
      Ember.set(this.get('rowsWithSelectionInfo')[this.get('targetIndex')], 'isSelected', true);
    },
    
    removefromselected() {
      Ember.set(this.get('rowsWithSelectionInfo')[this.get('targetIndex')], 'isSelected', false);
    }
  }
});

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
{{table-x}}
<br>
<br>

templates.components.table-x-row.hbs

I am at {{index}} and my data is {{row}} and am I selected {{isSelected}}

templates.components.table-x.hbs

  {{#each rowsWithSelectionInfo as |row index|}}
    {{table-x-row
      row=row.row
      index=index
      isSelected=row.isSelected
    }}
  {{/each}}
  <br>
  Type index to add to/remove from selected
  <br>
  {{input value=targetIndex}}
  <button onclick={{action 'addtoselected'}}>Add to selected</button>
  <button onclick={{action 'removefromselected'}}>Remove from index</button>
  
  

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}