restructure

lib/graph-mst.js

@@ -6,30 +6,26 @@ module.exports = function span(graph) {
   var edges = graph.edges
     .slice()
     .sort(function (a, b) { return a.weight - b.weight })
-  var indices = [ 0 ]
-  while (indices.length < graph.nodes.length) {
-    for (var i = 0; i < edges.length; i++) {
-      var edge = edges[i]
-      var a = edge.endpoints[0]
-      var b = edge.endpoints[1]
-      for (var j = 0; j < indices.length; j++) {
-        var o = indices[j]
-        var t = -1
-        if (a === o) {
-          t = b
-        } else if (b === o) {
-          t = a
-        }
-        if (t !== -1) {
-          break
-        }
+  var nodes = [ 0 ]
+  for (var i = 0; nodes.length < graph.nodes.length; i++) {
+    var edge = edges[i]
+    var a = edge.endpoints[0]
+    var b = edge.endpoints[1]
+    for (var j = 0; j < nodes.length; j++) {
+      var origin = nodes[j]
+      var target = -1
+      if (a === origin) {
+        target = b
+      } else if (b === origin) {
+        target = a
       }
-      if (t !== -1) {
-        if (indices.indexOf(t) === -1) {
-          indices.push(t)
+      if (target !== -1) {
+        if (nodes.indexOf(target) === -1) {
+          nodes.push(target)
           tree.edges.push(edge)
+          edges.splice(i, 1)
+          i = -1
         }
-        edges.splice(i, 1)
         break
       }
     }