From: Carlos Rodrigues <david-181@hotmail.com>
Date: Wed, 16 Oct 2019 19:34:51 +0000 (+0100)
Subject: perf(runtime-core): use faster diff map population (#319)
X-Git-Tag: v3.0.0-alpha.0~399
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=48b79d02e8a7c077eeae40bd94e3383067e54030;p=thirdparty%2Fvuejs%2Fcore.git

perf(runtime-core): use faster diff map population (#319)
---

diff --git a/packages/runtime-core/src/createRenderer.ts b/packages/runtime-core/src/createRenderer.ts
index 3dabb11e2e..d2dd89afce 100644
--- a/packages/runtime-core/src/createRenderer.ts
+++ b/packages/runtime-core/src/createRenderer.ts
@@ -1502,8 +1502,8 @@ export function createRenderer<
       // and oldIndex = 0 is a special value indicating the new node has
       // no corresponding old node.
       // used for determining longest stable subsequence
-      const newIndexToOldIndexMap = []
-      for (i = 0; i < toBePatched; i++) newIndexToOldIndexMap.push(0)
+      const newIndexToOldIndexMap = new Array(toBePatched)
+      for (i = 0; i < toBePatched; i++) newIndexToOldIndexMap[i] = 0
 
       for (i = s1; i <= e1; i++) {
         const prevChild = c1[i]