http: refactor to avoid unsafe array iteration

Author: aduh95

lib/_http_agent.js

@@ -201,8 +201,9 @@ function maybeEnableKeylog(eventName) {
       agent.emit('keylog', keylog, this);
     };
     // Existing sockets will start listening on keylog now.
-    for (const socket of ObjectValues(this.sockets)) {
-      socket.on('keylog', this[kOnKeylog]);
+    const sockets = ObjectValues(this.sockets);
+    for (let i = 0; i < sockets.length; i++) {
+      sockets[i].on('keylog', this[kOnKeylog]);
     }
   }
 }
@@ -426,7 +427,9 @@ Agent.prototype.removeSocket = function removeSocket(s, options) {
   if (!s.writable)
     ArrayPrototypePush(sets, this.freeSockets);
 
-  for (const sockets of sets) {
+  for (let sk = 0; sk < sets.length; sk++) {
+    const sockets = sets[sk];
+
     if (sockets[name]) {
       const index = ArrayPrototypeIndexOf(sockets[name], s);
       if (index !== -1) {
@@ -492,10 +495,14 @@ Agent.prototype.reuseSocket = function reuseSocket(socket, req) {
 };
 
 Agent.prototype.destroy = function destroy() {
-  for (const set of [this.freeSockets, this.sockets]) {
-    for (const key of ObjectKeys(set)) {
-      for (const setName of set[key]) {
-        setName.destroy();
+  const sets = [this.freeSockets, this.sockets];
+  for (let s = 0; s < sets.length; s++) {
+    const set = sets[s];
+    const keys = ObjectKeys(set);
+    for (let v = 0; v < keys.length; v++) {
+      const setName = set[keys[v]];
+      for (let n = 0; n < setName.length; n++) {
+        setName[n].destroy();
       }
     }
   }

lib/_http_outgoing.js

@@ -23,6 +23,7 @@
 
 const {
   ArrayIsArray,
+  ArrayPrototypeForEach,
   ArrayPrototypeJoin,
   ArrayPrototypePush,
   ArrayPrototypeUnshift,
@@ -390,9 +391,9 @@ function _storeHeader(firstLine, headers) {
       }
     } else if (ArrayIsArray(headers)) {
       if (headers.length && ArrayIsArray(headers[0])) {
-        for (const entry of headers) {
-          processHeader(this, state, entry[0], entry[1], true);
-        }
+        ArrayPrototypeForEach(headers, (entry) =>
+          processHeader(this, state, entry[0], entry[1], true)
+        );
       } else {
         if (headers.length % 2 !== 0) {
           throw new ERR_INVALID_ARG_VALUE('headers', headers);

lib/_http_server.js

@@ -23,6 +23,7 @@
 
 const {
   ArrayIsArray,
+  ArrayPrototypeForEach,
   ArrayPrototypePush,
   ArrayPrototypeShift,
   Error,
@@ -417,9 +418,8 @@ Server.prototype[EE.captureRejectionSymbol] = function(err, event, ...args) {
       const [ , res] = args;
       if (!res.headersSent && !res.writableEnded) {
         // Don't leak headers.
-        for (const name of res.getHeaderNames()) {
-          res.removeHeader(name);
-        }
+        ArrayPrototypeForEach(res.getHeaderNames(),
+                              (name) => res.removeHeader(name));
         res.statusCode = 500;
         res.end(STATUS_CODES[500]);
       } else {