diff --git a/lib/Minilisp.pm b/lib/Minilisp.pm
index a83d491..1d5dc1e 100644
--- a/lib/Minilisp.pm
+++ b/lib/Minilisp.pm
@@ -409,6 +409,23 @@ my %stdctx = (
         return length($a);
       }
   },
+  'apply' => sub {
+    my ($fn, $lst) = @_;
+    die "apply: First operand must be a function"
+      unless ref($fn) eq "CODE";
+    die "apply: Second operand must be a list"
+      unless ref($lst) eq "ARRAY";
+
+    return $fn->(@$lst);
+  },
+
+  # Input/output
+  'read-line' => sub {
+    my $fh = shift;
+    my $val = defined($fh) ? <$fh> : <>;
+    chomp $val;
+    return $val;
+  }
 );
 
 sub parser {