foo.diff

diff --git a/js/data/solar_system.js b/js/data/solar_system.js
index 91a18a6..ba9eb16 100644
--- a/js/data/solar_system.js
+++ b/js/data/solar_system.js
@@ -1,53 +1,48 @@
 var Node = require('../src/node');
 var Edge = require('../src/edge');
 
-var newNode = function(id) {
-    var node = new Node();
-    node.id = id;
-
-    return node;
-};
-
 var newEdge = function(options) {
     return new Edge(options.deltav, options.name);
 };
 
 // values taken from http://i.imgur.com/SqdzxzF.png
 
-var nodes = {
-    earth: newNode('Earth'),
-    leo: newNode('Low Earth Orbit'),
-    geo_transfer: newNode('Geostationary Transfer'),
-    geostationary: newNode('Geostationary Orbit'),
-    moon_transfer: newNode('Moon Transfer'),
-    low_moon_orbit: newNode('Low Moon Orbit'),
-    earth_transfer: newNode('Earth Transfer'),
-    mars_transfer: newNode('Mars Transfer'),
-    deimos_transfer: newNode('Deimos Transfer'),
-    low_deimos_orbit: newNode('Low Deimos Orbit'),
-    deimos: newNode('Deimos')
-};
+var SolarSystem = function() {
+    this.nodes = {
+        earth: new Node('Earth'),
+        leo: new Node('Low Earth Orbit'),
+        geo_transfer: new Node('Geostationary Transfer'),
+        geostationary: new Node('Geostationary Orbit'),
+        moon_transfer: new Node('Moon Transfer'),
+        low_moon_orbit: new Node('Low Moon Orbit'),
+        earth_transfer: new Node('Earth Transfer'),
+        mars_transfer: new Node('Mars Transfer'),
+        deimos_transfer: new Node('Deimos Transfer'),
+        low_deimos_orbit: new Node('Low Deimos Orbit'),
+        deimos: new Node('Deimos')
+    };
 
-var edges = {
-    low_earth_orbit: newEdge({ deltav: 9400, name: 'low_earth_orbit' }),
-    leo_geo_transfer: newEdge({ deltav: 2440, name: 'leo-geo_transfer' }),
-    geo_transfer_geo_orbit: newEdge({ deltav: 1470, name: 'geostationary_transfer-geostationary_orbit' }),
-    leo_moon_transfer: newEdge({ deltav: 3260, name: 'leo-moon_transfer' }),
-    moon_transfer_lmo: newEdge({ deltav: 680, name: 'moon_transfer-low_moon_orbit' }),
-    leo_earth_transfer: newEdge({ deltav: 3210, name: 'leo-earth_transfer' }),
-    earth_transfer_mars_transfer: newEdge({ deltav: 1060, name: 'earth_transfer-mars_transfer' }),
-    mars_transfer_deimos_transfer: newEdge({ deltav: 340, name: 'mars_transfer_deimos_transfer' }),
-    deimos_transfer_low_deimos_orbit: newEdge({ deltav: 652, name: 'deimos_transfer_low_deimos_orbit' }),
-    low_deimos_orbit_deimos: newEdge({ deltav: 4, name: 'low_deimos_orbit_deimos' })
+    this.edges = {
+        low_earth_orbit: newEdge({ deltav: 9400, name: 'low_earth_orbit' }),
+        leo_geo_transfer: newEdge({ deltav: 2440, name: 'leo-geo_transfer' }),
+        geo_transfer_geo_orbit: newEdge({ deltav: 1470, name: 'geostationary_transfer-geostationary_orbit' }),
+        leo_moon_transfer: newEdge({ deltav: 3260, name: 'leo-moon_transfer' }),
+        moon_transfer_lmo: newEdge({ deltav: 680, name: 'moon_transfer-low_moon_orbit' }),
+        leo_earth_transfer: newEdge({ deltav: 3210, name: 'leo-earth_transfer' }),
+        earth_transfer_mars_transfer: newEdge({ deltav: 1060, name: 'earth_transfer-mars_transfer' }),
+        mars_transfer_deimos_transfer: newEdge({ deltav: 340, name: 'mars_transfer_deimos_transfer' }),
+        deimos_transfer_low_deimos_orbit: newEdge({ deltav: 652, name: 'deimos_transfer_low_deimos_orbit' }),
+        low_deimos_orbit_deimos: newEdge({ deltav: 4, name: 'low_deimos_orbit_deimos' })
+    };
 };
-var reset = function() {
-    return {
-        nodes,
-        edges
+
+SolarSystem.prototype = {
+    resetNodes: function() {
+        for (var node in this.nodes) {
+            this.nodes[node].visited = false;
+        }
     }
 };
 
 // es6 !!
-module.exports = {
-    nodes, edges, reset
-};
\ No newline at end of file
+module.exports = new SolarSystem();
\ No newline at end of file
diff --git a/js/src/node.js b/js/src/node.js
index 9964b57..9c03707 100644
--- a/js/src/node.js
+++ b/js/src/node.js
@@ -1,7 +1,5 @@
-var Node = function(options) {
-    this.props = options || {};
-
-    this.id = new Date().getTime();
+var Node = function(id) {
+    this.id = id;
     this.edges = [];
     this.visited = false;
 };
diff --git a/js/test/graph.js b/js/test/graph.js
index 5b3e2e1..6675cb2 100644
--- a/js/test/graph.js
+++ b/js/test/graph.js
@@ -54,6 +54,7 @@ describe("walking the graph", function(t) {
     describe("walking the solar system delta v graph from earth to mars transfer orbit", function(t) {
         t.plan(1);
 
+        solar_system.resetNodes();
         var total_value = graph.walk(nodes.earth, nodes.mars_transfer);
         var expected_value = edges.low_earth_orbit.value +
                 edges.leo_earth_transfer.value +
@@ -63,14 +64,13 @@ describe("walking the graph", function(t) {
             total_value,
             expected_value
         );
-
-        graph.resetNodes();
         t.end();
     });
 
     describe("walking the solar system delta v graph from earth to deimos", function(t) {
         t.plan(1);
 
+        solar_system.resetNodes();
         var total_value = graph.walk(nodes.earth, nodes.deimos);
 
         var expected_value = edges.low_earth_orbit.value +
@@ -84,8 +84,6 @@ describe("walking the graph", function(t) {
             total_value,
             expected_value
         );
-
-        graph.resetNodes();
         t.end();
     });