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lib: adding perf notes js_stream_socket.js
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Leaving var in place of let for performance optimization
in short loops in hot paths. Added comments explaining why.

PR-URL: #30415
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Gireesh Punathil <[email protected]>
Reviewed-By: Denys Otrishko <[email protected]>
Reviewed-By: Trivikram Kamat <[email protected]>
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ryanj authored and MylesBorins committed Dec 17, 2019
1 parent e52237d commit 7d0631a
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1 change: 1 addition & 0 deletions lib/internal/js_stream_socket.js
Original file line number Diff line number Diff line change
Expand Up @@ -157,6 +157,7 @@ class JSStreamSocket extends Socket {
let pending = bufs.length;

this.stream.cork();
// Use `var` over `let` for performance optimization.
for (var i = 0; i < bufs.length; ++i)
this.stream.write(bufs[i], done);
this.stream.uncork();
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