On 12/19/2011 09:17 AM, clk wrote:
Hello,
I'm new to this mailing list. I'm trying to learn D to eventually use it
in production code.
I'm a little bit intimidated by the fact that the topics in the d-learn
list look rather advanced to a newbie like me.
I have 3 fairly simple questions:
1) Does D support something like the javascript 1.8 destructuring
assigment (multiple assigment in python):
[a, b] = [b, a];
I would love multiple assignment like this, but it's tricky. But your
usage isn't really multiple assignment as much as it is a swap. What I'd
love is something like this:
[a, b, c] = [get_a(), get_b(), get_c()];
Or
[a, b, c] = [to!(int)(argv[1]), some_other_value, argv[4]);
2) D doesn't seem to support the list comprehension syntax available in
python and javascript. Is this correct?
[f(x) for x in list if condition]
No, D's syntax is very C-ish. I don't expect syntax like this to ever
show up (though what you are doing is possible with things like
std.algorithm)
3) D's slice operator apparently doesn't allow the use of a stride other
than unity as is allowed with fortran and matlab. Is there a way to
implement this feature so that
[1, 2, 3, 4, 5][0..$:2] would refer to [1, 3, 5], etc..., where 2 is the
non unit stride. Or is the find function from std.algorithm the only
option to achieve the same behavior.
Ya, std.range, like Ali said.
I find the 3 features above extremely convenient in every day coding.
Thanks,
-clk
