change some manual array for loops to for..of

src/babel/generation/generators/statements.js

@@ -182,8 +182,8 @@ export function VariableDeclaration(node, print, parent) {
   var hasInits = false;
   // don't add whitespace to loop heads
   if (!t.isFor(parent)) {
-    for (var i = 0; i < node.declarations.length; i++) {
-      if (node.declarations[i].init) {
+    for (var declar of (node.declarations: Array)) {
+      if (declar.init) {
         // has an init so let's split it up over multiple lines
         hasInits = true;
       }

src/babel/traversal/path/index.js

@@ -29,7 +29,7 @@ var hoistVariablesVisitor = explode({
 
     var exprs = [];
 
-    for (var i = 0; i < node.declarations.length; i++) {
+    for (var declar of (node.declarations: Array)) {
       var declar = node.declarations[i];
       if (declar.init) {
         exprs.push(t.expressionStatement(

src/babel/traversal/scope.js

@@ -265,8 +265,8 @@ export default class Scope {
         if (node.source) {
           add(node.source);
         } else if (node.specifiers && node.specifiers.length) {
-          for (var i = 0; i < node.specifiers.length; i++) {
-            add(node.specifiers[i]);
+          for (var specifier of (node.specifiers: Array)) {
+            add(specifier);
           }
         } else if (node.declaration) {
           add(node.declaration);
@@ -283,8 +283,7 @@ export default class Scope {
       } else if (t.isCallExpression(node)) {
         add(node.callee);
       } else if (t.isObjectExpression(node) || t.isObjectPattern(node)) {
-        for (var i = 0; i < node.properties.length; i++) {
-          var prop = node.properties[i];
+        for (var prop of (node.properties: Array)) {
           add(prop.key || prop.argument);
         }
       }

src/babel/util.js

@@ -97,13 +97,13 @@ export function booleanify(val: any): boolean {
 export function shouldIgnore(filename, ignore, only) {
   filename = slash(filename);
   if (only.length) {
-    for (var i = 0; i < only.length; i++) {
-      if (only[i].test(filename)) return false;
+    for (var pattern of (only: Array)) {
+      if (pattern.test(filename)) return false;
     }
     return true;
   } else if (ignore.length) {
-    for (var i = 0; i < ignore.length; i++) {
-      if (ignore[i].test(filename)) return true;
+    for (var pattern of (ignore: Array)) {
+      if (pattern.test(filename)) return true;
     }
   }