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! :)
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! :)
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}
After 30 years I'm still in love with Icon!
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