Program Components

This small program combines several generic components:

• Iterate-Accumulate: Iterate through a sequence of items, accumulating some aspect of the items.

• Find-Update: Find an item in an indexing structure using its key value, then update the record with information from the item.

• dolist: an iterator for linked lists in Lisp.

• alist: association list, a kind of database structure.

• Sum: a kind of accumulator.

In addition, there are several interfaces of glue code: how to get the sequence from the input, how to get the key from the item, what aspect of the item to accumulate.

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