2 files changed, 64 insertions, 0 deletions
diff --git a/challenge-283/dave-jacoby/perl/ch-1.pl b/challenge-283/dave-jacoby/perl/ch-1.pl
new file mode 100644
index 0000000000..1b1dc7820a
--- /dev/null
+++ b/challenge-283/dave-jacoby/perl/ch-1.pl
@@ -0,0 +1,33 @@
+#!/usr/bin/env perl
+
+use strict;
+use warnings;
+use experimental qw{ postderef say signatures state };
+
+use List::Util qw{ uniq };
+
+my @examples = (    # added a couple test entries
+
+    [ 3, 3, 1 ], 
+    [ 3, 2, 4, 2, 4 ], 
+    [1], 
+    [ 4, 3, 1, 1, 1, 4 ]
+);
+
+for my $example (@examples) {
+    my $input = join ', ', $example->@*;
+    my $output = unique_number($example);
+    say <<"END";
+    Input:  \@int = ($input)
+    Output: $output
+END
+}
+
+sub unique_number ($input) {
+    my $hash;
+    for my $i ( @$input ) {
+        $hash->{$i}++;
+    }
+    my @results = grep {$hash->{$_} == 1 } keys %$hash;
+    return shift @results;
+}
diff --git a/challenge-283/dave-jacoby/perl/ch-2.pl b/challenge-283/dave-jacoby/perl/ch-2.pl
new file mode 100644
index 0000000000..65aceb597a
--- /dev/null
+++ b/challenge-283/dave-jacoby/perl/ch-2.pl
@@ -0,0 +1,31 @@
+#!/usr/bin/env perl
+
+use strict;
+use warnings;
+use experimental qw{ say postderef signatures };
+
+my @examples = (    # added a couple test entries
+
+    [ 1, 2, 1, 0 ],
+    [ 0, 3, 0 ],
+);
+
+for my $example (@examples) {
+    my $input  = join ', ', $example->@*;
+    my $output = digital_count_value($example) 
+        ? 'true' : 'false';
+    say <<"END";
+    Input:  \@int = ($input)
+    Output: $output
+END
+}
+
+sub digital_count_value ($input) {
+    my $s = -1 + scalar $input->@*;
+    for my $i ( 0 .. $s ) {
+        my $j = $input->[$i];
+        my $k = scalar grep { $_ == $i } $input->@*;
+        return 0 unless $j == $k;
+    }
+    return 1;
+}