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Some parameters contain a set of objects — e.g., all items in an order — rather than a single value. In your template, you can add a block for each of these kinds of objects: 
`@{ for item in Order.Items }
Price: ${ item.Price }
@{ end for }`
In this example, item is an arbitrary name attributed to one order item so that you can use its parameters. Inside the for...end for block you can access a particular order item. In addition, this block can include an arbitrary HTML code, conditions, and even nested loops. If the example above contains three order items, the output will be:
Price: 5
Price: 10
Price: 25
Also, you can use the “set” keyword in @{ set a = a + 1 } to add a counter.

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Here are some possible use cases:

To display the total purchase value: ​ 
`@{ set Total = 0 }
@{ for product in Session.GetAddedToListProducts("Cart").Take(10) }
@{ set Total = Total + product.Price }
@{ end for }`
To list the product IDs separated by a comma: ​ 
`@{ set Ids = "" }
@{ for product in Products.GetBySegment("PopularInStock").Take(10) }
@{ if Ids != "" }
@{ set Ids = Ids & "," }
@{ end if }
@{ set Ids = Ids & product.IDs.C1 }
@{ end for }`