William H. Mitchell wrote:
> At 11:22 AM 10/23/2009, Sidney Reilley II wrote:
>> I also read that "&fail" will trigger backtracking as in:
>>
>> writes(! name) + &fail
>
> Some might say that &fail is a crutch for the uncreative! :)
Oh, I /can/ be creative when it comes to making code /fail/ ;)
It's making code "fail" constructively that is the Icon/Unicon challenge.
> Any failing expression can be used to produce the same behavior:
>
> % ie
> Icon Evaluator, Version 1.1, ? for help
> ][ write(!"abc") + (1 = 0)
> a
> b
> c
> Failure
>
> ][ write(!"abc") + !""
> a
> b
> c
> Failure
>
> This suggests a "Most Creative Failure" competition! :)
Yeah! Forcing a "fail" is not as cool conjuring one up.
> It's interesting to note that any binary operator can be used instead
> of "+" -- if the second expression doesn't produce a result, the
> operator is never invoked.
>
> Incidentally, something not mentioned in this discussion is the
> notion of an expression's "result sequence" -- the sequence of
> results an expression will product when driven to failure. For
> example, the expression 7 has the result sequence {7}. !"abc" has
> the result sequence {"a", "b", "c"}
>
> 1 to 4 < 3 has an empty result sequence but for (1 to 4) < 3 it's {3,3}
I'm making head-way - I get the above!
> After 30 years I'm still in love with Icon!
Are you finished the CIAN module/library infrastructure yet? Just
teasing! ;)
--
Sid
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