How to Call Function on Each dom-repeat Element

I am trying to call a function on each element inside of a dom-repeat template.

<dom-repeat items="[[cart]]" as="entry">
  <template>
    <shop-cart-item id="item"></shop-cart-item>
  </template>
</dom-repeat>

...

checkStatus() {
  this.$.item.doSomething();
}

How can I call doSomething on each element?

You can iterate through nodes like:

checkStatus() {
  const forEach = f => x => Array.prototype.forEach.call(x, f);

  forEach((item) => {
    if(item.id == 'cartItem') {
      console.log(item);
      item.doSomething(); // call function on item
    }
  })(this.$.cartItems.childNodes)
}