[Issue 12272] New: and(), or(), xor() to compose predicates

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=12272

           Summary: and(), or(), xor() to compose predicates
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: bearophile_hugs at eml.cc


--- Comment #0 from bearophile_hugs at eml.cc 2014-02-27 03:14:00 PST ---
In Java8 there are functions like and() or() xor() that are handy to compose
predicates:

Predicate<String> startsWithJ = (n) -> n.startsWith("J");
Predicate<String> fourLetterLong = (n) -> n.length() == 4;
names.stream().filter(startsWithJ.and(fourLetterLong))

In D:

auto startsWithJ = (string n) => n.startsWith("J");
auto fourLetterLong = (string n) => n.length == 4;
names.filter!(and!(startsWithJ, fourLetterLong))

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