Merge pull request #418 from RohitPaul0007/patch-61

Update acyclic.js

lib/acyclic.js

@@ -1,19 +1,19 @@
 "use strict";
 
-var greedyFAS = require("./greedy-fas");
-var uniqueId = require("./util").uniqueId;
+let greedyFAS = require("./greedy-fas");
+let uniqueId = require("./util").uniqueId;
 
 module.exports = {
   run: run,
   undo: undo
 };
 
 function run(g) {
-  var fas = (g.graph().acyclicer === "greedy"
+  let fas = (g.graph().acyclicer === "greedy"
     ? greedyFAS(g, weightFn(g))
     : dfsFAS(g));
   fas.forEach(e => {
-    var label = g.edge(e);
+    let label = g.edge(e);
     g.removeEdge(e);
     label.forwardName = e.name;
     label.reversed = true;
@@ -28,9 +28,9 @@ function run(g) {
 }
 
 function dfsFAS(g) {
-  var fas = [];
-  var stack = {};
-  var visited = {};
+  let fas = [];
+  let stack = {};
+  let visited = {};
 
   function dfs(v) {
     if (visited.hasOwnProperty(v)) {
@@ -54,11 +54,11 @@ function dfsFAS(g) {
 
 function undo(g) {
   g.edges().forEach(e => {
-    var label = g.edge(e);
+    let label = g.edge(e);
     if (label.reversed) {
       g.removeEdge(e);
 
-      var forwardName = label.forwardName;
+      let forwardName = label.forwardName;
       delete label.reversed;
       delete label.forwardName;
       g.setEdge(e.w, e.v, label, forwardName);