On Sat, Nov 5, 2011 at 11:21 AM, L N <[email protected]> wrote:
> Wondering if Factor has something similar.
>
For trivial things like rewriting 'swap swap', we let the compiler's
optimizer deal with those. It performs many of those optimizations. To
implement your own compile-time transforms, you can use Factor's MACRO:
words. They return a quotation which replaces the macro call at compile
time:
MACRO: or ( -- quot )
[ [ t ] swap if ] ;
However, such things are rarely necessary since the compiler is good at
unraveling and optimizing higher-order functions already.
-Joe
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