solution week 076-1

1 files changed, 25 insertions, 0 deletions

diff --git a/challenge-076/wambash/raku/ch-1.raku b/challenge-076/wambash/raku/ch-1.raku
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+#!/usr/bin/env raku
+#https://en.wikipedia.org/wiki/Goldbach%27s_conjecture
+#Maybe, it does not work for all natural numbers.
+
+subset OddPrime      of Int where { $_ !%% 2 &       .is-prime };
+subset OddPrimeSucc  of Int where { $_ !%% 2 & ($_-2).is-prime };
+subset Even of Int where *  %% 2;
+
+proto prime-sum ($ where * ≥ 2 ) {*}
+multi prime-sum (              2 --> 1 ) {}
+multi prime-sum (OddPrime      $ --> 1 ) {}
+multi prime-sum (Even          $ --> 2 ) {}
+multi prime-sum (OddPrimeSucc  $ --> 2 ) {}
+multi prime-sum (              $ --> 3 ) {}
+
+sub MAIN (:$test) {
+    use Test;
+    is prime-sum(2),  1;
+    is prime-sum(4),  2;
+    is prime-sum(13), 1;
+    is prime-sum(9),  2;
+    is prime-sum(27), 3;
+    dies-ok { prime-sum(1) };
+    done-testing();
+}