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doc: add explanation why keep var with for loop in async_hooks #30380

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doc: add explanation why keep var with for loop in async_hooks #30380

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2 changes: 2 additions & 0 deletions lib/internal/async_hooks.js
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Expand Up @@ -129,6 +129,7 @@ function emitInitNative(asyncId, type, triggerAsyncId, resource) {
active_hooks.call_depth += 1;
// Use a single try/catch for all hooks to avoid setting up one per iteration.
try {
// Using var here instead of let because "for (var ...)" is faster than let
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for (var i = 0; i < active_hooks.array.length; i++) {
if (typeof active_hooks.array[i][init_symbol] === 'function') {
active_hooks.array[i][init_symbol](
Expand Down Expand Up @@ -159,6 +160,7 @@ function emitHook(symbol, asyncId) {
// Use a single try/catch for all hook to avoid setting up one per
// iteration.
try {
// Using var here instead of let because "for (var ...)" is faster than let
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for (var i = 0; i < active_hooks.array.length; i++) {
if (typeof active_hooks.array[i][symbol] === 'function') {
active_hooks.array[i][symbol](asyncId);
Expand Down