[Issue 8755] New: Change the order of reduce arguments

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=8755

           Summary: Change the order of reduce arguments
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: adamsibson at hotmail.com


--- Comment #0 from adamsibson at hotmail.com 2012-10-04 09:03:45 PDT ---
Reduce cannot have a seed applied elegantly when used with UFCS due to the
argument order being range, seed. A newly named version with the argument order
reversed would allow the use of the full range of reduce's capabilities with
UFCS arguments.

Suggestion:

auto fold(range, seed) {}

to allow:

[1,2,3,4,5].fold!((a, b) => a + b * b)(0).writeln;

With the possibility of a longer chain in place of the array argument, a normal
use with UFCS. At present only a few uses such as sum, max and min are usable
with the unseeded form, limiting the usefulness of reduce.

Giving it a default of "a + b" would also improve its use as summing is
probably the most common use case.

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