1 files changed, 26 insertions, 0 deletions
diff --git a/challenge-121/simon-proctor/raku/ch-1.raku b/challenge-121/simon-proctor/raku/ch-1.raku
new file mode 100644
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+++ b/challenge-121/simon-proctor/raku/ch-1.raku
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+#!/usr/bin/env raku
+
+subset EightBit of Int where 0 <= * <= 255;
+subset ValidIdx of Int where 1 <= * <= 8;
+
+multi sub MAIN('test') is hidden-from-USAGE {
+    use Test;
+    is bit-flipped( 12, 3 ), 8;
+    is bit-flipped( 18, 4 ), 26;
+    done-testing;
+}
+
+#| Given a number between 0 and 255 and a number between 1 and 8 flips the bit at index n
+multi sub MAIN(
+    EightBit $m, #= Integer between 0 and 255
+    ValidIdx $n, #= Integer between 1 and 8
+) {
+    bit-flipped( $m, $n ).say;
+}
+
+
+sub bit-flipped( EightBit $m, ValidIdx $n ) {
+    my @l = sprintf( "%08d", $m.base(2) ).comb();
+    @l[8-$n] = 1-@l[8-$n];
+    return @l.join("").parse-base(2);
+}