Other Structures
Icon also allows the user to easily construct their own lists (or arrays):
aCat :=
The items within a list can be of any sort, including other structures. To quickly build larger lists, Icon includes the list generator; i := list(10, "word") generates a list containing 10 copies of "word".
Like arrays in other languages, Icon allows items to be looked up by position, e.g., weight := aCat.
The bang-syntax, e.g., every write(!aCat), will print out four lines, each with one element.
Icon includes stack-like functions, push and pop to allow them to form the basis of stacks and queues.
Icon also includes functionality for sets and tables (known as hashes, associative arrays, dictionaries, etc.):
symbols := table(0)
symbols := 1
symbols := 2
This code creates a table that will use zero as the default value of any unknown key. It then adds two items into it, with the keys "there" and "here", and values 1 and 2.
Read more about this topic: Icon (programming Language)
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