http2: rename counter in mapToHeaders inner loop

mkrawczuk · MylesBorins · commit d2fea9fb4a09 · 2020-03-24T02:55:04.000-04:00
This change is to prevent potential bugs - e.g., someone might automatically use the variable `k` instead of `key`, that is used in vicinity of this loop. Also changed postincrement to preincrement in iteration steps. It is probably done by the optimizer anyway, but otherwise it will save an opcode each iteration. And it is a good practice. PR-URL: #32012 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
diff --git a/lib/internal/http2/util.js b/lib/internal/http2/util.js
@@ -442,13 +442,13 @@ function mapToHeaders(map,
   let count = 0;
   const keys = ObjectKeys(map);
   const singles = new Set();
-  let i;
+  let i, j;
   let isArray;
   let key;
   let value;
   let isSingleValueHeader;
   let err;
-  for (i = 0; i < keys.length; i++) {
+  for (i = 0; i < keys.length; ++i) {
     key = keys[i];
     value = map[key];
     if (value === undefined || key === '')
@@ -488,8 +488,8 @@ function mapToHeaders(map,
       throw new ERR_HTTP2_INVALID_CONNECTION_HEADERS(key);
     }
     if (isArray) {
-      for (var k = 0; k < value.length; k++) {
-        const val = String(value[k]);
+      for (j = 0; j < value.length; ++j) {
+        const val = String(value[j]);
         ret += `${key}\0${val}\0`;
       }
       count += value.length;
