store bufLength in a variable

Author: gurgunday

lib/buffer.js

@@ -583,8 +583,9 @@ Buffer.concat = function concat(list, length) {
   if (length === undefined) {
     length = 0;
     for (let i = 0; i < list.length; i++) {
-      if (list[i].length) {
-        length += list[i].length;
+      const bufLength = list[i].length;
+      if (bufLength) {
+        length += bufLength;
       }
     }
   } else {
@@ -602,15 +603,16 @@ Buffer.concat = function concat(list, length) {
         `list[${i}]`, ['Buffer', 'Uint8Array'], list[i]);
     }
 
-    if (buf.length === 0 || pos >= length) {
-      // Empty buf or destination is full; subsequent copies are no-ops.
+    const bufLength = buf.length;
+    if (bufLength === 0 || pos >= length) {
+      // Empty buf, or destination is full and subsequent copies are no-ops.
       // We don't break to preserve compatibility and throw if isUint8Array fails.
       continue;
     }
 
     const available = length - pos;
-    const toCopy = buf.length > available ? available : buf.length;
-    if (toCopy === buf.length) {
+    const toCopy = bufLength > available ? available : bufLength;
+    if (toCopy === bufLength) {
       TypedArrayPrototypeSet(buffer, buf, pos);
     } else {
       TypedArrayPrototypeSet(buffer, TypedArrayPrototypeSubarray(buf, 0, toCopy), pos);