Gabriel Dos Reis <[EMAIL PROTECTED]> writes:
> On Tue, 8 Jan 2008, Martin Rubey wrote:
>
> |
> | Gabriel Dos Reis <[EMAIL PROTECTED]> writes:
> |
> | > | > Indeed. And that is what the AXIOM book by Jenks&Sutor documents.
> | > | > Apologies for asking, but why would we want to change that?
> | > |
> | > | Did I say something must be changed?
> | >
> | > I don't think I said you, Ralf, suggested that.
> | >
> | > My understanding of the discussion was that someone was proposing
> something
> | > different from the documented => iterate.
> |
> | No, sorry. As far as I know, in SPAD,
> |
> | => iterate (in fact, not sure about that one)
> |
> | => "next"
> |
> | => "iterate"
> |
> | => nil
> |
> | => "leave"
> |
> | are all equivalent. And I proposed to make them all the same. The
> semantics
> | of => should *not* be changed.
>
> My suggestion is that all, except the `=> iterate', are not documented.
What's the documentation of => iterate?
> We should be advertizing only the documented form. Personally, I do not see
> the need to recommend them. OpenAxiom will unspport them when I get time.
> Almost al of them are confusing, specially the `=> "leave"' form.
But the semantics is that
block1
condition =>
block2
block3
executes block1 and block3 if condition evaluates to false, otherwise block1
and block2.
In
condition => "leave"
it will evaluate "leave" if condition evaluates to true. "leave" evaluates to
itself, a string. In a loop, it doesn't matter to what the final block of the
loop evaluates, the result is thrown away anyway.
I don't think I want to have that changed. How would you want to change it?
Martin
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