On 2010-12-15 23:33, Andrei Alexandrescu wrote:
On 12/15/10 4:18 PM, retard wrote:
Wed, 15 Dec 2010 22:23:35 +0100, Jacob Carlborg wrote:
Array(1, 2, 3, 4, 5).sortWith(_> _)
The first instance of _ (from left to right) is replaced with the first
element of the parameter tuple, the second with second element, etc.
This is actually very useful since many lambdas only use 1-2 parameters.
It has its limitations. For example referring to the same parameter
requires a named parameter or some other hack. Combined with Haskell
style partial application this allows stuff like:
Array(1, 2, 3, 4, 5).foreach { println }
Array(1, 2, 3, 4, 5).filter(2<)
For short lambdas I prefer Phobos' convention of using "a" and "b", e.g.
"2 < a" or "a < b". Since it's a string, "_ < _" would have been usable
with Phobos too but I wouldn't like such a change.
Andrei
The point here isn't that we want "a" and "b" to be replaced with "_"
the point is that we want to get rid of the string and have a shorter
and less verbose syntax for delegate literals.
--
/Jacob Carlborg
