Negative subscripts in slices: Legal? Documented?
- Posted by AndySerpa Feb 27, 2011
- 1177 views
I notice that negative subscripts work in slices (working from the end of the sequence), but I can find no documentation that they do. Is this a feature or a bug?
If a feature, it is surely going to cause some hard to find bugs as bizarre slices like this actually work:
s = {1,2,3,4,5,6} ? s[$-10..$-8]
returns {2,3,4}, but I'd kinda like it to crash there.
The above is equivalent to the below, which also works:
s = {1,2,3,4,5,6} ? s[-4..-2]
No doubt there are cases when this would be useful, but I think more often it is just going to return a legal slice when in fact you've got a bug in your program and it ought to crash. Any way to make it to act like v3.1?
Is this in the docs somewhere and I missed it?
