Small speedup to sources / sinks

kkowar · Sep 24, 2014 · 456fe49 · 456fe49
1 parent a1caaec
commit 456fe49
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/lib/graph.js b/lib/graph.js
@@ -75,13 +75,13 @@ Graph.prototype.nodes = function() {
 
 Graph.prototype.sources = function() {
   return _.filter(this.nodes(), function(v) {
-    return !this.inEdges(v).length;
+    return _.isEmpty(this._in[v]);
   }, this);
 };
 
 Graph.prototype.sinks = function() {
   return _.filter(this.nodes(), function(v) {
-    return !this.outEdges(v).length;
+    return _.isEmpty(this._out[v]);
   }, this);
 };