From ea45e9f71588572a2f4b9299a86cedc3c8e9c72a Mon Sep 17 00:00:00 2001
From: Eric Wong <e@yhbt.net>
Date: Thu, 23 Jan 2020 23:05:55 +0000
Subject: nntp: simplify setting X-Alt-Message-ID

We can cut down on the number of operations required
using "grep" instead of "foreach".
---
 lib/PublicInbox/NNTP.pm | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/lib/PublicInbox/NNTP.pm b/lib/PublicInbox/NNTP.pm
index 35729f00..12f74c3d 100644
--- a/lib/PublicInbox/NNTP.pm
+++ b/lib/PublicInbox/NNTP.pm
@@ -423,10 +423,7 @@ sub set_nntp_headers ($$$$$) {
 		$hdr->header_set('Message-ID', $mid0);
 		my @alt = $hdr->header('X-Alt-Message-ID');
 		my %seen = map { $_ => 1 } (@alt, $mid0);
-		foreach my $m (@mids) {
-			next if $seen{$m}++;
-			push @alt, $m;
-		}
+		push(@alt, grep { !$seen{$_}++ } @mids);
 		$hdr->header_set('X-Alt-Message-ID', @alt);
 	}
 
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