Solution to task 2

1 files changed, 61 insertions, 0 deletions

diff --git a/challenge-241/jo-37/perl/ch-2.pl b/challenge-241/jo-37/perl/ch-2.pl
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+++ b/challenge-241/jo-37/perl/ch-2.pl
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+#!/usr/bin/perl -s
+
+use v5.24;
+use Test2::V0 '!float';
+use Math::Prime::Util 'factor';
+use PDL;
+use PDL::NiceSlice;
+
+our ($tests, $examples);
+
+run_tests() if $tests || $examples;	# does not return
+
+die <<EOS unless @ARGV;
+usage: $0 [-examples] [-tests] [N...]
+
+-examples
+    run the examples from the challenge
+ 
+-tests
+    run some tests
+
+N...
+    list of positive integers
+
+EOS
+
+
+### Input and Output
+
+say "(@{prime_order(@ARGV)})";
+
+
+### Implementation
+
+# This task is very similar to task 2 from week 238.  Following the same
+# approach.
+
+sub prime_order {
+    long(map [scalar factor $_, $_], @_)->qsortvec->((1))->unpdl;
+}
+
+
+### Examples and tests
+
+sub run_tests {
+    SKIP: {
+        skip "examples" unless $examples;
+
+        is prime_order(11, 8, 27, 4), [11, 4, 8, 27], 'example 1';
+    }
+
+    SKIP: {
+        skip "tests" unless $tests;
+
+        is prime_order(27, 8, 121, 49, 167, 131),
+            [131, 167, 49, 121, 8, 27], 'another example';
+	}
+
+    done_testing;
+    exit;
+}