Data commit

Task/Time-a-function/Perl/time-a-function-1.pl

@@ -0,0 +1,18 @@
+use Benchmark;
+use Memoize;
+
+sub fac1 {
+    my $n = shift;
+    return $n == 0 ? 1 : $n * fac1($n - 1);
+}
+sub fac2 {
+    my $n = shift;
+    return $n == 0 ? 1 : $n * fac2($n - 1);
+}
+memoize('fac2');
+
+my $result = timethese(100000, {
+    'fac1' => sub { fac1(50) },
+    'fac2' => sub { fac2(50) },
+});
+Benchmark::cmpthese($result);

Task/Time-a-function/Perl/time-a-function-2.pl

@@ -0,0 +1,26 @@
+sub cpu_time {
+  my ($user,$system,$cuser,$csystem) = times;
+  $user + $system
+}
+
+sub time_it {
+  my $action = shift;
+  my $startTime = cpu_time();
+  $action->(@_);
+  my $finishTime = cpu_time();
+  $finishTime - $startTime
+}
+
+printf "Identity(4) takes %f seconds.\n", time_it(sub {@_}, 4);
+# outputs "Identity(4) takes 0.000000 seconds."
+
+sub sum {
+  my $x = shift;
+  foreach (0 .. 999999) {
+    $x += $_;
+  }
+  $x
+}
+
+printf "Sum(4) takes %f seconds.\n", time_it(\&sum, 4);
+# outputs "Sum(4) takes 0.280000 seconds."