From 166bda8cdda3fdff52d16a1f6a612b3dd82ae0eb Mon Sep 17 00:00:00 2001
From: Mike Bostock <mbostock@gmail.com>
Date: Wed, 20 Apr 2016 12:38:01 -0700
Subject: [PATCH] Initialize link.index, too.

---
 src/link.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/link.js b/src/link.js
index 80be4a2..4020f63 100644
--- a/src/link.js
+++ b/src/link.js
@@ -38,7 +38,7 @@ export default function(links) {
     }
 
     for (i = 0, bias = new Array(m); i < m; ++i) {
-      l = links[i];
+      l = links[i], l.index = i;
       if (typeof l.source === "number") l.source = nodes[l.source];
       if (typeof l.target === "number") l.target = nodes[l.target];
       ++count[l.source.index];