lib: refactor to use let

move variable into each for loop

PR-URL: #40364
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Zijian Liu <lxxyxzj@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>

Author: gdccwxx

lib/internal/debugger/inspect_client.js

@@ -61,8 +61,6 @@ function validateHandshake(requestKey, responseKey) {
 }
 
 function encodeFrameHybi17(payload) {
-  var i;
-
   const dataLength = payload.length;
 
   let singleByteLength;
@@ -71,7 +69,7 @@ function encodeFrameHybi17(payload) {
     singleByteLength = kEightBytePayloadLengthField;
     additionalLength = Buffer.alloc(8);
     let remaining = dataLength;
-    for (i = 0; i < 8; ++i) {
+    for (let i = 0; i < 8; ++i) {
       additionalLength[7 - i] = remaining & 0xFF;
       remaining >>= 8;
     }
@@ -92,7 +90,7 @@ function encodeFrameHybi17(payload) {
 
   const mask = Buffer.alloc(4);
   const masked = Buffer.alloc(dataLength);
-  for (i = 0; i < dataLength; ++i) {
+  for (let i = 0; i < dataLength; ++i) {
     masked[i] = payload[i] ^ mask[i % kMaskingKeyWidthInBytes];
   }
 
@@ -147,7 +145,7 @@ function decodeFrameHybi17(data) {
     case kEightBytePayloadLengthField:
       payloadOffset += 8;
       payloadLength = 0;
-      for (var i = 0; i < 8; ++i) {
+      for (let i = 0; i < 8; ++i) {
         payloadLength <<= 8;
         payloadLength |= data[2 + i];
       }