fs.walk performance improvement (denoland/deno_std#221)

Original: https://github.com/denoland/deno_std/commit/ccb452f77580148084e7b2dbcfb52b984e0d740e

1 files changed, 6 insertions, 2 deletions

diff --git a/fs/walk.ts b/fs/walk.ts
index f2a9b6c57..c76803a2e 100644
--- a/fs/walk.ts
+++ b/fs/walk.ts
@@ -31,7 +31,9 @@ export async function* walk(
       options.onError(err);
     }
   }
-  for (let f of ls) {
+  const length = ls.length;
+  for (var i = 0; i < length; i++) {
+    let f = ls[i];
     if (f.isSymlink()) {
       if (options.followSymlinks) {
         f = await resolve(f);
@@ -71,7 +73,9 @@ export function* walkSync(
       options.onError(err);
     }
   }
-  for (let f of ls) {
+  const length = ls.length;
+  for (var i = 0; i < length; i++) {
+    let f = ls[i];
     if (f.isSymlink()) {
       if (options.followSymlinks) {
         f = resolveSync(f);