On Thu, Oct 1, 2009 at 1:34 PM, Hugh Aguilar <[email protected]> wrote:
> I was primarily confused because I didn't realize that in Factor some datums
> (tuples) are passed by reference, and some datums (numbers) are passed by
> value.
Actually, all data is passed by reference, however numbers are
immutable whereas a tuple is not (unless you declare all slots
read-only).
> A sequence
> with numbers in it would not be easily modified in place,
This is completely false,
11 { 10 17 5 } [ set-second ] keep .
=> { 10 11 5 }
> but a sequence
> with tuples in it would be easilty modified in place because the datums are
> all references to the original data that is someplace else.
You're confusing modifying a sequence in place with modifying objects
that it contains. The latter is possible even for elements in
immutable sequences, like quotations.
Slava
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