- Added solutions by Arne Sommer.

18 files changed, 982 insertions, 895 deletions

diff --git a/challenge-031/arne-sommer/blog.txt b/challenge-031/arne-sommer/blog.txt
new file mode 100644
index 0000000000..6a5e3ccb54
--- /dev/null
+++ b/challenge-031/arne-sommer/blog.txt
@@ -0,0 +1 @@
+https://raku-musings.com/dynamic-zero.html
diff --git a/challenge-031/arne-sommer/perl6/ch-1.p6 b/challenge-031/arne-sommer/perl6/ch-1.p6
new file mode 100755
index 0000000000..9a93f19269
--- /dev/null
+++ b/challenge-031/arne-sommer/perl6/ch-1.p6
@@ -0,0 +1,9 @@
+#! /usr/bin/env raku
+
+unit sub MAIN (Numeric $a = 10, Numeric $b = 0);
+
+my $c = $a / $b;
+
+try say "a/b = $c";
+
+say "Division by zero detected." if $!;
diff --git a/challenge-031/arne-sommer/perl6/ch-2.p6 b/challenge-031/arne-sommer/perl6/ch-2.p6
new file mode 100755
index 0000000000..70ef1cb964
--- /dev/null
+++ b/challenge-031/arne-sommer/perl6/ch-2.p6
@@ -0,0 +1,11 @@
+#! /usr/bin/env raku
+
+unit sub MAIN ($name = '$a');
+
+my $a = 12;
+my $b = 15;
+my $c = 19;
+my $d = 26;
+my $e = 99;
+
+say "The value of $name: " ~ ::($name);
diff --git a/challenge-031/arne-sommer/perl6/dynavar b/challenge-031/arne-sommer/perl6/dynavar
new file mode 100755
index 0000000000..70ef1cb964
--- /dev/null
+++ b/challenge-031/arne-sommer/perl6/dynavar
@@ -0,0 +1,11 @@
+#! /usr/bin/env raku
+
+unit sub MAIN ($name = '$a');
+
+my $a = 12;
+my $b = 15;
+my $c = 19;
+my $d = 26;
+my $e = 99;
+
+say "The value of $name: " ~ ::($name);
diff --git a/challenge-031/arne-sommer/perl6/dynavar-hash b/challenge-031/arne-sommer/perl6/dynavar-hash
new file mode 100755
index 0000000000..b132c43f71
--- /dev/null
+++ b/challenge-031/arne-sommer/perl6/dynavar-hash
@@ -0,0 +1,9 @@
+#! /usr/bin/env raku
+
+unit sub MAIN ($name, $value);
+
+my %store;
+
+%store{$name} = $value;
+
+say "Name: %store{$name}";
diff --git a/challenge-031/arne-sommer/perl6/zero-deferred b/challenge-031/arne-sommer/perl6/zero-deferred
new file mode 100755
index 0000000000..490b099d22
--- /dev/null
+++ b/challenge-031/arne-sommer/perl6/zero-deferred
@@ -0,0 +1,7 @@
+#! /usr/bin/env raku
+
+my $a = 10 / 2;
+my $b = 20 / 0;
+my $c = 30 / 11;
+
+say "Ok";
diff --git a/challenge-031/arne-sommer/perl6/zero-error b/challenge-031/arne-sommer/perl6/zero-error
new file mode 100755
index 0000000000..4e6ca06319
--- /dev/null
+++ b/challenge-031/arne-sommer/perl6/zero-error
@@ -0,0 +1,11 @@
+#! /usr/bin/env raku
+
+my $a = 10 / 2;
+my $b = 20 / 0;
+my $c = 30 / 11;
+
+say "Ok";
+
+say $a;
+say $b;
+say $c;
diff --git a/challenge-031/arne-sommer/perl6/zero-try b/challenge-031/arne-sommer/perl6/zero-try
new file mode 100755
index 0000000000..9a93f19269
--- /dev/null
+++ b/challenge-031/arne-sommer/perl6/zero-try
@@ -0,0 +1,9 @@
+#! /usr/bin/env raku
+
+unit sub MAIN (Numeric $a = 10, Numeric $b = 0);
+
+my $c = $a / $b;
+
+try say "a/b = $c";
+
+say "Division by zero detected." if $!;
diff --git a/stats/pwc-current.json b/stats/pwc-current.json
index 258e90eb4e..25644e3228 100644
--- a/stats/pwc-current.json
+++ b/stats/pwc-current.json
@@ -1,58 +1,49 @@
 {
-   "chart" : {
-      "type" : "column"
-   },
-   "title" : {
-      "text" : "Perl Weekly Challenge - 031"
-   },
-   "tooltip" : {
-      "pointFormat" : "<span style='color:{point.color}'>{point.name}</span>: <b>{point.y:f}</b><br/>",
-      "followPointer" : 1,
-      "headerFormat" : "<span style='font-size:11px'>{series.name}</span><br/>"
-   },
-   "legend" : {
-      "enabled" : 0
+   "xAxis" : {
+      "type" : "category"
    },
    "subtitle" : {
-      "text" : "[Champions: 16] Last updated at 2019-10-24 14:20:16 GMT"
-   },
-   "yAxis" : {
-      "title" : {
-         "text" : "Total Solutions"
-      }
+      "text" : "[Champions: 17] Last updated at 2019-10-24 23:44:45 GMT"
    },
    "series" : [
       {
+         "name" : "Perl Weekly Challenge - 031",
+         "colorByPoint" : 1,
          "data" : [
             {
                "name" : "Andrezgz",
-               "drilldown" : "Andrezgz",
-               "y" : 2
+               "y" : 2,
+               "drilldown" : "Andrezgz"
             },
             {
-               "y" : 2,
+               "drilldown" : "Arne Sommer",
+               "y" : 3,
+               "name" : "Arne Sommer"
+            },
+            {
+               "drilldown" : "Burkhard Nickels",
                "name" : "Burkhard Nickels",
-               "drilldown" : "Burkhard Nickels"
+               "y" : 2
             },
             {
-               "name" : "Dave Cross",
                "drilldown" : "Dave Cross",
-               "y" : 2
+               "y" : 2,
+               "name" : "Dave Cross"
             },
             {
-               "name" : "Dave Jacoby",
                "drilldown" : "Dave Jacoby",
+               "name" : "Dave Jacoby",
                "y" : 2
             },
             {
-               "y" : 2,
                "drilldown" : "Duane Powell",
-               "name" : "Duane Powell"
+               "name" : "Duane Powell",
+               "y" : 2
             },
             {
-               "y" : 5,
+               "drilldown" : "Javier Luque",
                "name" : "Javier Luque",
-               "drilldown" : "Javier Luque"
+               "y" : 5
             },
             {
                "y" : 2,
@@ -66,33 +57,33 @@
             },
             {
                "name" : "Maxim Kolodyazhny",
-               "drilldown" : "Maxim Kolodyazhny",
-               "y" : 1
+               "y" : 1,
+               "drilldown" : "Maxim Kolodyazhny"
             },
             {
-               "name" : "Nazareno Delucca",
                "drilldown" : "Nazareno Delucca",
+               "name" : "Nazareno Delucca",
                "y" : 2
             },
             {
                "y" : 1,
-               "drilldown" : "Pete Houston",
-               "name" : "Pete Houston"
+               "name" : "Pete Houston",
+               "drilldown" : "Pete Houston"
             },
             {
-               "drilldown" : "Simon Proctor",
                "name" : "Simon Proctor",
-               "y" : 1
+               "y" : 1,
+               "drilldown" : "Simon Proctor"
             },
             {
-               "y" : 2,
                "name" : "Steven Wilson",
+               "y" : 2,
                "drilldown" : "Steven Wilson"
             },
             {
                "name" : "Tyler Limkemann",
-               "drilldown" : "Tyler Limkemann",
-               "y" : 2
+               "y" : 2,
+               "drilldown" : "Tyler Limkemann"
             },
             {
                "drilldown" : "Vyacheslav Volgarev",
@@ -100,68 +91,93 @@
                "y" : 2
             },
             {
+               "name" : "Yet Ebreo",
                "y" : 3,
-               "drilldown" : "Yet Ebreo",
-               "name" : "Yet Ebreo"
+               "drilldown" : "Yet Ebreo"
             }
-         ],
-         "colorByPoint" : 1,
-         "name" : "Perl Weekly Challenge - 031"
+         ]
       }
    ],
+   "plotOptions" : {
+      "series" : {
+         "dataLabels" : {
+            "enabled" : 1,
+            "format" : "{point.y}"
+         },
+         "borderWidth" : 0
+      }
+   },
+   "chart" : {
+      "type" : "column"
+   },
    "drilldown" : {
       "series" : [
          {
-            "id" : "Andrezgz",
-            "name" : "Andrezgz",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
-            ]
+            ],
+            "name" : "Andrezgz",
+            "id" : "Andrezgz"
+         },
+         {
+            "data" : [
+               [
+                  "Perl 6",
+                  2
+               ],
+               [
+                  "Blog",
+                  1
+               ]
+            ],
+            "name" : "Arne Sommer",
+            "id" : "Arne Sommer"
          },
          {
+            "id" : "Burkhard Nickels",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
             ],
-            "name" : "Burkhard Nickels",
-            "id" : "Burkhard Nickels"
+            "name" : "Burkhard Nickels"
          },
          {
+            "id" : "Dave Cross",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
             ],
-            "name" : "Dave Cross",
-            "id" : "Dave Cross"
+            "name" : "Dave Cross"
          },
          {
             "name" : "Dave Jacoby",
-            "id" : "Dave Jacoby",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
-            ]
+            ],
+            "id" : "Dave Jacoby"
          },
          {
+            "name" : "Duane Powell",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
             ],
-            "id" : "Duane Powell",
-            "name" : "Duane Powell"
+            "id" : "Duane Powell"
          },
          {
+            "id" : "Javier Luque",
             "data" : [
                [
                   "Perl 5",
@@ -176,58 +192,57 @@
                   1
                ]
             ],
-            "id" : "Javier Luque",
             "name" : "Javier Luque"
          },
          {
+            "id" : "Lars Balker",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
             ],
-            "name" : "Lars Balker",
-            "id" : "Lars Balker"
+            "name" : "Lars Balker"
          },
          {
             "name" : "Markus Holzer",
-            "id" : "Markus Holzer",
             "data" : [
                [
                   "Perl 6",
                   2
                ]
-            ]
+            ],
+            "id" : "Markus Holzer"
          },
          {
             "name" : "Maxim Kolodyazhny",
-            "id" : "Maxim Kolodyazhny",
             "data" : [
                [
                   "Perl 5",
                   1
                ]
-            ]
+            ],
+            "id" : "Maxim Kolodyazhny"
          },
          {
-            "name" : "Nazareno Delucca",
-            "id" : "Nazareno Delucca",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
-            ]
+            ],
+            "name" : "Nazareno Delucca",
+            "id" : "Nazareno Delucca"
          },
          {
+            "name" : "Pete Houston",
             "data" : [
                [
                   "Perl 5",
                   1
                ]
             ],
-            "id" : "Pete Houston",
-            "name" : "Pete Houston"
+            "id" : "Pete Houston"
          },
          {
             "data" : [
@@ -240,14 +255,14 @@
             "id" : "Simon Proctor"
          },
          {
-            "id" : "Steven Wilson",
-            "name" : "Steven Wilson",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
-            ]
+            ],
+            "name" : "Steven Wilson",
+            "id" : "Steven Wilson"
          },
          {
             "data" : [
@@ -256,20 +271,21 @@
                   2
                ]
             ],
-            "id" : "Tyler Limkemann",
-            "name" : "Tyler Limkemann"
+            "name" : "Tyler Limkemann",
+            "id" : "Tyler Limkemann"
          },
          {
+            "name" : "Vyacheslav Volgarev",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
             ],
-            "name" : "Vyacheslav Volgarev",
             "id" : "Vyacheslav Volgarev"
          },
          {
+            "name" : "Yet Ebreo",
             "data" : [
                [
                   "Perl 5",
@@ -280,21 +296,24 @@
                   1
                ]
             ],
-            "name" : "Yet Ebreo",
             "id" : "Yet Ebreo"
          }
       ]
    },
-   "plotOptions" : {
-      "series" : {
-         "dataLabels" : {
-            "enabled" : 1,
-            "format" : "{point.y}"
-         },
-         "borderWidth" : 0
+   "yAxis" : {
+      "title" : {
+         "text" : "Total Solutions"
       }
    },
-   "xAxis" : {
-      "type" : "category"
+   "tooltip" : {
+      "headerFormat" : "<span style='font-size:11px'>{series.name}</span><br/>",
+      "pointFormat" : "<span style='color:{point.color}'>{point.name}</span>: <b>{point.y:f}</b><br/>",
+      "followPointer" : 1
+   },
+   "legend" : {
+      "enabled" : 0
+   },
+   "title" : {
+      "text" : "Perl Weekly Challenge - 031"
    }
 }
diff --git a/stats/pwc-language-breakdown-summary.json b/stats/pwc-language-breakdown-summary.json
index 1d8e0ca60a..a2a2e45184 100644
--- a/stats/pwc-language-breakdown-summary.json
+++ b/stats/pwc-language-breakdown-summary.json
@@ -8,11 +8,8 @@
          }
       }
    },
-   "subtitle" : {
-      "text" : "Last updated at 2019-10-24 14:20:26 GMT"
-   },
-   "legend" : {
-      "enabled" : "false"
+   "title" : {
+      "text" : "Perl Weekly Challenge Contributions - 2019"
    },
    "tooltip" : {
       "pointFormat" : "<b>{point.y:.0f}</b>"
@@ -20,34 +17,31 @@
    "chart" : {
       "type" : "column"
    },
-   "yAxis" : {
-      "title" : {
-         "text" : null
-      },
-      "min" : 0
+   "legend" : {
+      "enabled" : "false"
    },
-   "title" : {
-      "text" : "Perl Weekly Challenge Contributions - 2019"
+   "subtitle" : {
+      "text" : "Last updated at 2019-10-24 23:44:56 GMT"
    },
    "series" : [
       {
+         "name" : "Contributions",
          "dataLabels" : {
-            "color" : "#FFFFFF",
+            "style" : {
+               "fontFamily" : "Verdana, sans-serif",
+               "fontSize" : "13px"
+            },
             "format" : "{point.y:.0f}",
-            "align" : "right",
-            "enabled" : "true",
             "y" : 10,
+            "enabled" : "true",
+            "color" : "#FFFFFF",
             "rotation" : -90,
-            "style" : {
-               "fontSize" : "13px",
-               "fontFamily" : "Verdana, sans-serif"
-            }
+            "align" : "right"
          },
-         "name" : "Contributions",
          "data" : [
             [
                "Blog",
-               329
+               330
             ],
             [
                "Perl 5",
@@ -55,9 +49,15 @@
             ],
             [
                "Perl 6",
-               758
+               760
             ]
          ]
       }
-   ]
+   ],
+   "yAxis" : {
+      "min" : 0,
+      "title" : {
+         "text" : null
+      }
+   }
 }
diff --git a/stats/pwc-language-breakdown.json b/stats/pwc-language-breakdown.json
index bec77f35d9..c4cacd9716 100644
--- a/stats/pwc-language-breakdown.json
+++ b/stats/pwc-language-breakdown.json
@@ -1,17 +1,173 @@
 {
-   "legend" : {
-      "enabled" : "false"
-   },
-   "tooltip" : {
-      "pointFormat" : "<span style=\"color:{point.color}\">Challenge {point.name}</span>: <b>{point.y:f}</b><br/>",
-      "followPointer" : "true",
-      "headerFormat" : "<span style=\"font-size:11px\"></span>"
+   "subtitle" : {
+      "text" : "Click the columns to drilldown the language breakdown. Last updated at 2019-10-24 23:44:56 GMT"
    },
+   "series" : [
+      {
+         "name" : "Perl Weekly Challenge Languages",
+         "data" : [
+            {
+               "drilldown" : "001",
+               "name" : "#001",
+               "y" : 132
+            },
+            {
+               "drilldown" : "002",
+               "name" : "#002",
+               "y" : 104
+            },
+            {
+               "drilldown" : "003",
+               "name" : "#003",
+               "y" : 66
+            },
+            {
+               "name" : "#004",
+               "y" : 86,
+               "drilldown" : "004"
+            },
+            {
+               "drilldown" : "005",
+               "y" : 66,
+               "name" : "#005"
+            },
+            {
+               "drilldown" : "006",
+               "name" : "#006",
+               "y" : 48
+            },
+            {
+               "drilldown" : "007",
+               "y" : 56,
+               "name" : "#007"
+            },
+            {
+               "y" : 70,
+               "name" : "#008",
+               "drilldown" : "008"
+            },
+            {
+               "drilldown" : "009",
+               "y" : 68,
+               "name" : "#009"
+            },
+            {
+               "drilldown" : "010",
+               "y" : 60,
+               "name" : "#010"
+            },
+            {
+               "drilldown" : "011",
+               "name" : "#011",
+               "y" : 78
+            },
+            {
+               "drilldown" : "012",
+               "name" : "#012",
+               "y" : 83
+            },
+            {
+               "drilldown" : "013",
+               "y" : 76,
+               "name" : "#013"
+            },
+            {
+               "name" : "#014",
+               "y" : 95,
+               "drilldown" : "014"
+            },
+            {
+               "y" : 93,
+               "name" : "#015",
+               "drilldown" : "015"
+            },
+            {
+               "name" : "#016",
+               "y" : 66,
+               "drilldown" : "016"
+            },
+            {
+               "name" : "#017",
+               "y" : 79,
+               "drilldown" : "017"
+            },
+            {
+               "name" : "#018",
+               "y" : 76,
+               "drilldown" : "018"
+            },
+            {
+               "y" : 95,
+               "name" : "#019",
+               "drilldown" : "019"
+            },
+            {
+               "drilldown" : "020",
+               "y" : 95,
+               "name" : "#020"
+            },
+            {
+               "y" : 67,
+               "name" : "#021",
+               "drilldown" : "021"
+            },
+            {
+               "drilldown" : "022",
+               "y" : 63,
+               "name" : "#022"
+            },
+            {
+               "drilldown" : "023",
+               "name" : "#023",
+               "y" : 91
+            },
+            {
+               "y" : 70,
+               "name" : "#024",
+               "drilldown" : "024"
+            },
+            {
+               "drilldown" : "025",
+               "y" : 55,
+               "name" : "#025"
+            },
+            {
+               "drilldown" : "026",
+               "y" : 70,
+               "name" : "#026"
+            },
+            {
+               "drilldown" : "027",
+               "name" : "#027",
+               "y" : 58
+            },
+            {
+               "drilldown" : "028",
+               "y" : 78,
+               "name" : "#028"
+            },
+            {
+               "drilldown" : "029",
+               "name" : "#029",
+               "y" : 76
+            },
+            {
+               "y" : 112,
+               "name" : "#030",
+               "drilldown" : "030"
+            },
+            {
+               "drilldown" : "031",
+               "y" : 36,
+               "name" : "#031"
+            }
+         ],
+         "colorByPoint" : "true"
+      }
+   ],
    "drilldown" : {
       "series" : [
          {
-            "name" : "001",
-            "id" : "001",
             "data" : [
                [
                   "Perl 5",
@@ -25,7 +181,9 @@
                   "Blog",
                   11
                ]
-            ]
+            ],
+            "id" : "001",
+            "name" : "001"
          },
          {
             "name" : "002",
@@ -60,11 +218,10 @@
                   8
                ]
             ],
-            "id" : "003",
-            "name" : "003"
+            "name" : "003",
+            "id" : "003"
          },
          {
-            "name" : "004",
             "data" : [
                [
                   "Perl 5",
@@ -79,6 +236,7 @@
                   9
                ]
             ],
+            "name" : "004",
             "id" : "004"
          },
          {
@@ -96,12 +254,10 @@
                   11
                ]
             ],
-            "id" : "005",
-            "name" : "005"
+            "name" : "005",
+            "id" : "005"
          },
          {
-            "name" : "006",
-            "id" : "006",
             "data" : [
                [
                   "Perl 5",
@@ -115,10 +271,11 @@
                   "Blog",
                   7
                ]
-            ]
+            ],
+            "id" : "006",
+            "name" : "006"
          },
          {
-            "name" : "007",
             "data" : [
                [
                   "Perl 5",
@@ -133,10 +290,12 @@
                   10
                ]
             ],
-            "id" : "007"
+            "id" : "007",
+            "name" : "007"
          },
          {
             "name" : "008",
+            "id" : "008",
             "data" : [
                [
                   "Perl 5",
@@ -150,11 +309,9 @@
                   "Blog",
                   12
                ]
-            ],
-            "id" : "008"
+            ]
          },
          {
-            "id" : "009",
             "data" : [
                [
                   "Perl 5",
@@ -169,6 +326,7 @@
                   13
                ]
             ],
+            "id" : "009",
             "name" : "009"
          },
          {
@@ -190,6 +348,8 @@
             ]
          },
          {
+            "name" : "011",
+            "id" : "011",
             "data" : [
                [
                   "Perl 5",
@@ -203,13 +363,11 @@
                   "Blog",
                   9
                ]
-            ],
-            "id" : "011",
-            "name" : "011"
+            ]
          },
          {
-            "name" : "012",
             "id" : "012",
+            "name" : "012",
             "data" : [
                [
                   "Perl 5",
@@ -263,6 +421,7 @@
          },
          {
             "id" : "015",
+            "name" : "015",
             "data" : [
                [
                   "Perl 5",
@@ -276,8 +435,7 @@
                   "Blog",
                   15
                ]
-            ],
-            "name" : "015"
+            ]
          },
          {
             "data" : [
@@ -294,11 +452,12 @@
                   12
                ]
             ],
-            "id" : "016",
-            "name" : "016"
+            "name" : "016",
+            "id" : "016"
          },
          {
             "id" : "017",
+            "name" : "017",
             "data" : [
                [
                   "Perl 5",
@@ -312,10 +471,10 @@
                   "Blog",
                   12
                ]
-            ],
-            "name" : "017"
+            ]
          },
          {
+            "id" : "018",
             "name" : "018",
             "data" : [
                [
@@ -330,10 +489,11 @@
                   "Blog",
                   14
                ]
-            ],
-            "id" : "018"
+            ]
          },
          {
+            "name" : "019",
+            "id" : "019",
             "data" : [
                [
                   "Perl 5",
@@ -347,11 +507,11 @@
                   "Blog",
                   13
                ]
-            ],
-            "id" : "019",
-            "name" : "019"
+            ]
          },
          {
+            "id" : "020",
+            "name" : "020",
             "data" : [
                [
                   "Perl 5",
@@ -365,13 +525,9 @@
                   "Blog",
                   13
                ]
-            ],
-            "id" : "020",
-            "name" : "020"
+            ]
          },
          {
-            "name" : "021",
-            "id" : "021",
             "data" : [
                [
                   "Perl 5",
@@ -385,10 +541,13 @@
                   "Blog",
                   10
                ]
-            ]
+            ],
+            "id" : "021",
+            "name" : "021"
          },
          {
             "id" : "022",
+            "name" : "022",
             "data" : [
                [
                   "Perl 5",
@@ -402,8 +561,7 @@
                   "Blog",
                   10
                ]
-            ],
-            "name" : "022"
+            ]
          },
          {
             "data" : [
@@ -420,8 +578,8 @@
                   12
                ]
             ],
-            "id" : "023",
-            "name" : "023"
+            "name" : "023",
+            "id" : "023"
          },
          {
             "name" : "024",
@@ -442,6 +600,7 @@
             ]
          },
          {
+            "name" : "025",
             "id" : "025",
             "data" : [
                [
@@ -456,10 +615,10 @@
                   "Blog",
                   12
                ]
-            ],
-            "name" : "025"
+            ]
          },
          {
+            "id" : "026",
             "name" : "026",
             "data" : [
                [
@@ -474,12 +633,9 @@
                   "Blog",
                   10
                ]
-            ],
-            "id" : "026"
+            ]
          },
          {
-            "name" : "027",
-            "id" : "027",
             "data" : [
                [
                   "Perl 5",
@@ -493,11 +649,13 @@
                   "Blog",
                   9
                ]
-            ]
+            ],
+            "id" : "027",
+            "name" : "027"
          },
          {
-            "name" : "028",
             "id" : "028",
+            "name" : "028",
             "data" : [
                [