Yes to (0).

To (1), be careful: too much generality could have severe performance effects. I would need to take a long time before deciding that the operation of + should be defined in a script.

Henry Rich

On 4/25/2015 9:26 PM, Raul Miller wrote:
Hypothetically speaking, it would be possible to implement J with
certain primitives defined "at run time" by delegating their
implementation to some name in some locale.

For that matter, we could design the interpreter to treat its
executable as an archive (like maybe a zip file) with some !: command
to execute a named element from the archive as a script. Once we have
that, it becomes straightforward to do a variety of things with J...

Thanks,

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