JavaScriptCollection
diff --git a/‎d3.js‎
Lines changed: 7 additions & 8 deletions b/‎d3.js‎
Lines changed: 7 additions & 8 deletions
@@ -834,27 +834,26 @@
     function bind(group, groupData) {
       var i, n = group.length, m = groupData.length, n0 = Math.min(n, m), updateNodes = new Array(m), enterNodes = new Array(m), exitNodes = new Array(n), node, nodeData;
       if (key) {
-        var nodeByKeyValue = new d3_Map(), dataKeys = new d3_Set(), keyValues = [], keyValue;
+        var nodeByKeyValue = new d3_Map(), keyValues = new Array(n), keyValue;
         for (i = -1; ++i < n; ) {
           if (nodeByKeyValue.has(keyValue = key.call(node = group[i], node.__data__, i))) {
             exitNodes[i] = node;
           } else {
             nodeByKeyValue.set(keyValue, node);
           }
-          keyValues.push(keyValue);
+          keyValues[i] = keyValue;
         }
         for (i = -1; ++i < m; ) {
-          if (node = nodeByKeyValue.get(keyValue = key.call(groupData, nodeData = groupData[i], i))) {
+          if (!(node = nodeByKeyValue.get(keyValue = key.call(groupData, nodeData = groupData[i], i)))) {
+            enterNodes[i] = d3_selection_dataNode(nodeData);
+          } else if (node !== true) {
             updateNodes[i] = node;
             node.__data__ = nodeData;
-          } else if (!dataKeys.has(keyValue)) {
-            enterNodes[i] = d3_selection_dataNode(nodeData);
           }
-          dataKeys.add(keyValue);
-          nodeByKeyValue.remove(keyValue);
+          nodeByKeyValue.set(keyValue, true);
         }
         for (i = -1; ++i < n; ) {
-          if (nodeByKeyValue.has(keyValues[i])) {
+          if (nodeByKeyValue.get(keyValues[i]) !== true) {
             exitNodes[i] = group[i];
           }
         }