Randal L. Schwartz wrote:
>
> We really need a clean way to distinguish those four cases:
>
> "yes" and keep going
> "no" and keep going
> "yes" and abort after this one
> "no" and abort after this one
>
> What would you have "last" do? And how would you distinguish "the
> other one"?
This is my suggestion: the only effect of "last" should be to signal
to the grep not to iterate further; and, as with the current sitch,
whatever the last evaluated value in the block would be the "returned"
value. So to effect the above, you would do the following:
Just as with the current implementation:
"yes" and keep going: grep { ... 1 } @a;
"no" and keep going: grep { ... 0 } @a;
Exercising the new feature:
"yes" and abort after this one: grep { ... 1, last } @a;
"no" and abort after this one: grep { ... 0, last } @a;
Of course, "last" would have to be ignored in the algorithm which
determines the "last evaluated value"...
--
John Porter
We're building the house of the future together.
