From 2f581385162eda15053584a54c5fe1069c1617e2 Mon Sep 17 00:00:00 2001
From: Tim Sebastian <tim.sebastian@gmail.com>
Date: Thu, 26 Jan 2017 18:08:27 +1100
Subject: [PATCH] remove unnecessary iteration if b.chunks is not set

---
 lib/Chunk.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/Chunk.js b/lib/Chunk.js
index c56dd730b..c2bfa79e2 100644
--- a/lib/Chunk.js
+++ b/lib/Chunk.js
@@ -205,9 +205,9 @@ class Chunk {
 		other.chunks.length = 0;
 
 		other.blocks.forEach(b => {
-			b.chunks = (b.chunks || [this]).map(c => {
+			b.chunks = b.chunks ? b.chunks.map(c => {
 				return c === other ? this : c;
-			}, this);
+			}, this) : [this];
 			b.chunkReason = reason;
 			this.addBlock(b);
 		}, this);