On Thursday, 12 April 2012 at 17:00:37 UTC, DH wrote:
Hi. I was wondering why the following works:
filter!(a => a % 2 == 0)(map!(a => a + 1)([1,2,3,4,5]))
but the following does not:
[1,2,3,4,5]
.map!(a => a + 1)()
.filter!(a => a % 2 == 0)()
...giving me the error `Error: no property 'filter' for type
'Result'`
The dot syntax works fine if I'm just doing one
map/filter/etc., though. Is
there a better way to do chaining like this? Am I
misunderstanding how the dot
syntax sugar works or how map/filter/etc work in D? I'd prefer
not to use the
first style as it can get a bit unwieldy...
Thanks for your time!
~DH
It works for the first argument because UFCS (that is, calling
free functions as members) works for arrays but not for other
types (ranges in this case) in DMD <=2.058. Thanks to the
intrepid Kenji it works for all types in the upcoming 2.059. You
can try out the 2.059 beta here:
http://ftp.digitalmars.com/dmd2beta.zip Your second example
should work fine in it.
Regards,
Brad Anderson
