[Issue 4725] New: std.algorithm.sum()

[d-bugmail]

http://d.puremagic.com/issues/show_bug.cgi?id=4725

           Summary: std.algorithm.sum()
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Phobos
        AssignedTo: nob...@puremagic.com
        ReportedBy: bearophile_h...@eml.cc


--- Comment #0 from bearophile_h...@eml.cc 2010-08-25 18:10:40 PDT ---
Writing Python code shows that computing the sum of a sequence of int/FP values
is a very common operation. In D you may write it as:

import std.stdio: writeln;
import std.algorithm: reduce;
void main() {
    auto arr = new double[10];
    arr[] = 1.0;
    auto t = reduce!q{a + b}(arr);
    writeln(t);
}



But I suggest to create std.algorithm.sum() as shorthand, because reduce
requires a bit of cognitive burden that is out of place for this so common and
basic operation:

import std.stdio: writeln;
import std.algorithm: sum;
void main() {
    auto arr = new double[10];
    arr[] = 1.0;
    auto t = sum(arr);
    writeln(t);
}


As second optional argument sum() may accept the starting value:
auto total = sum(range, 0.0);

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