Check if an item is in array (array contains an element) for Handlebars

context.js

{
    "favourites": [2, 3],
    "hobbies": [
        {
            "name": "playing football",
            "id": 1
        },
        {
            "name": "reading books",
            "id": 2
        },
        {
            "name": "programming in python",
            "id": 3
        },
        {
            "name": "jogging",
            "id": 4
        }
    ]
}

function.js

Handlebars.registerHelper('ifIn', function(elem, list, options) {
  if(list.indexOf(elem) > -1) {
    return options.fn(this);
  }
  return options.inverse(this);
});

result.html

<div>
    <div style="">
        playing football
    </div>
    <div style="color: red">
        reading books
    </div>
    <div style="color: red">
        programming in python
    </div>
    <div style="">
        jogging
    </div>
</div>

template.html

<script id="hobbies_template" type="text/x-handlebars-template">
  <div>
  {{#each hobbies }}
      <div style="{{#ifIn id ../favourites }}color: red{{/ifIn}}">
          {{ name }}
      </div>
  {{/each}}
  </div>
</script>