From 9ce9561737fed57de3772de8c5c7d58afc852d8c Mon Sep 17 00:00:00 2001
From: Misko Hevery <misko@hevery.com>
Date: Tue, 14 May 2019 21:45:40 -0700
Subject: [PATCH] perf(ivy): clean up createNodeAtIndex for speed (#30453)

PR Close #30453
---
 packages/core/src/render3/instructions/shared.ts | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/packages/core/src/render3/instructions/shared.ts b/packages/core/src/render3/instructions/shared.ts
index 869e16e88f..c2667855cf 100644
--- a/packages/core/src/render3/instructions/shared.ts
+++ b/packages/core/src/render3/instructions/shared.ts
@@ -259,9 +259,9 @@ export function createNodeAtIndex(
   lView[adjustedIndex] = native;
 
   const previousOrParentTNode = getPreviousOrParentTNode();
-  const isParent = getIsParent();
   let tNode = tView.data[adjustedIndex] as TNode;
   if (tNode == null) {
+    const isParent = getIsParent();
     const parent =
         isParent ? previousOrParentTNode : previousOrParentTNode && previousOrParentTNode.parent;
 
@@ -282,10 +282,9 @@ export function createNodeAtIndex(
         previousOrParentTNode.next = tNode;
       }
     }
-  }
-
-  if (tView.firstChild == null) {
-    tView.firstChild = tNode;
+    if (index === 0) {
+      tView.firstChild = tNode;
+    }
   }
 
   setPreviousOrParentTNode(tNode);