You can use slots>tuple.
TUPLE: em id name path ;
C: <em> em
: make-em-all ( -- seq )
{
{ 1 "x" "path" }
{ 2 "y" "math" }
{ 3 "z" "bath" }
} [ em slots>tuple ] map ;
IN: scratchpad make-em-all .
{
T{ em { id 1 } { name "x" } { path "path" } }
T{ em { id 2 } { name "y" } { path "math" } }
T{ em { id 3 } { name "z" } { path "bath" } }
}
On Wed, Sep 23, 2015 at 8:25 AM, Alexander Ilin <ajs...@yandex.ru> wrote:
> Hello!
>
> I'd like to return a sequence of tuples. How do I approach this?
> Here's what I tried (and failed) so far:
>
> TUPLE: em id name path ;
> C: <em> em
>
> : make-em-all ( -- seq )
> {
> { 1 "x" "path" }
> { 2 "y" "math" }
> { 3 "z" "bath" }
> } [ <em> ] map ;
>
> The problem here was that <em> expects three items on stack, but
> receives a sigle sequence object with three items inside.
> I tried to find a way to dump sequence onto the stack, but the following
> code failed to even compile due to stack effect reasons:
>
> ...
> } [ [ dup ] each <em> ] map ;
>
> Any advice? Basically, I wanted to declaratively setup a bunch of
> objects in a sort of init-word, put them onto stack as a sequence, and deal
> with them interactively afterwards, possibly saving to an Sqlite DB for
> future use.
>
> ---=====---
> Александр
>
>
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