As your only using these to loop over, I would use the native forEach instead of Bonzo's:

```javascript
$hiddenSummaryPlaceholders = common.toArray(context.getElementsByClassName('.js-article__summary.is-off'));

//then later
$hiddenSummaryPlaceholders.forEach(function(el,i) {
    //doStuff
});
```

Notice how I used a context in the selector, as your current one will grab across all swipe panes.