Special accessors for arrays, Text and Blob (tweet)

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Certain built-in structured data types can be iterated over their enclosed elements by special accessor functions:

• values() (or vals()), keys() for arrays ([T] and [var T])
• chars() for Text
• values() (or vals()) for Blob

All these accessors return an iterator (Iter<T>) of the element type, so they can be used in for-expressions. Furthermore all of these structures can be asked there count of elements: s.size() : Nat, and the arrays' elements can be accessed with a.get(nth) and a.put(nth, v) (for mutable ones).