/** SHOPIFY CHECKOUT PAGE - GTM JS VARIABLES */

//Return the Product_IDs as an array
function() {
  var prods = window.Shopify.checkout.line_items;
  var prod_ids = [];
  var i;
  if (!prods) {
    return;
  }
  for (i = 0; i < prods.length; i++) {
    if (prods[i].product_id) {
      prod_ids.push(prods[i].product_id);
    }
  }
  return prod_ids;
}

//Return the Product_IDs as a comma separated list (string)
function() {
  var prods = window.Shopify.checkout.line_items;
  var prod_ids = [];
  var i;
  if (!prods) {
    return;
  }
  for (i = 0; i < prods.length; i++) {
    if (prods[i].product_id) {
      prod_ids.push(prods[i].product_id);
    }
  }
  return prod_ids.join(' , ');
}