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os: avoid unnecessary usage of var#42563

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nodejs-github-bot merged 1 commit intonodejs:masterfrom
VoltrexKeyva:avoid-var
Apr 3, 2022
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os: avoid unnecessary usage of var#42563
nodejs-github-bot merged 1 commit intonodejs:masterfrom
VoltrexKeyva:avoid-var

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@VoltrexKeyva VoltrexKeyva commented Apr 1, 2022

The var keyword is known to be problematic and is not needed here,
so better to use the let keyword for variable declarations.

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os: avoid unnecessary usage of var
01921f1 
The `var` keyword is known to be problematic and is not needed here,
so better to use the `let` keyword for variable declarations.
@nodejs-github-bot nodejs-github-bot added needs-ci PRs that need a full CI run. os Issues and PRs related to the os subsystem. labels Apr 1, 2022
tniessen
tniessen approved these changes Apr 1, 2022
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I'm surprised to see we still have some var declarations (assuming there are no performance edge cases here, but I think V8 fixed those years ago).

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RaisinTen commented Apr 1, 2022 •
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Running the os benchmarks to be sure because we have a benchmark test for

node/benchmark/os/networkInterfaces.js

Line 13 in d484cba

networkInterfaces();

which we are touching in this PR and we still have comments like

node/lib/internal/async_hooks.js

Lines 197 to 198 in d484cba

// Using var here instead of let because "for (var ...)" is faster than let.
// Refs: https://github.com/nodejs/node/pull/30380#issuecomment-552948364

https://ci.nodejs.org/job/benchmark-node-micro-benchmarks/1115/

                                confidence improvement accuracy (*)   (**)  (***)
os/cpus.js n=30000                              0.00 %       ±0.68% ±0.91% ±1.18%
os/loadavg.js n=5000000                        -0.40 %       ±1.17% ±1.55% ±2.02%
os/networkInterfaces.js n=10000                -2.51 %       ±4.75% ±6.32% ±8.23%

I guess, we can replace all the vars with let/consts.

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LGTM

@marsonya marsonya added author ready PRs that have at least one approval, no pending requests for changes, and a CI started. and removed author ready PRs that have at least one approval, no pending requests for changes, and a CI started. labels Apr 1, 2022
@Trott Trott mentioned this pull request Apr 2, 2022
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@VoltrexKeyva VoltrexKeyva added the request-ci Add this label to start a Jenkins CI on a PR. label Apr 2, 2022
@github-actions github-actions bot removed the request-ci Add this label to start a Jenkins CI on a PR. label Apr 2, 2022
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CI: https://ci.nodejs.org/job/node-test-pull-request/43263/

@RaisinTen RaisinTen added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Apr 2, 2022
@VoltrexKeyva VoltrexKeyva removed the needs-ci PRs that need a full CI run. label Apr 2, 2022
@Trott Trott added the needs-ci PRs that need a full CI run. label Apr 3, 2022
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Trott commented Apr 3, 2022

A bit of an aside, but I've re-added the needs-ci label.

It's perhaps a bit confusingly named, but the needs-ci label is there for the commit queue automation. It tells the automation that this is a PR that should land only if there is a passing Jenkins CI run. It's not a label letting other people know that we need a CI run. So it should generally not be manually removed (unless it was incorrectly placed on a PR in the first place.)

Refs: https://github.com/nodejs/node-core-utils/blob/919ec3b784a2589aa88a1b2629b98d57283555a4/lib/pr_checker.js#L431-L438

@Trott Trott added the commit-queue Add this label to land a pull request using GitHub Actions. label Apr 3, 2022
@nodejs-github-bot nodejs-github-bot removed the commit-queue Add this label to land a pull request using GitHub Actions. label Apr 3, 2022
@nodejs-github-bot nodejs-github-bot merged commit b5f0b49 into nodejs:master Apr 3, 2022
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nodejs-github-bot commented Apr 3, 2022

Landed in b5f0b49

@VoltrexKeyva VoltrexKeyva deleted the avoid-var branch April 3, 2022 16:34
juanarbol pushed a commit to juanarbol/node that referenced this pull request Apr 5, 2022
@VoltrexKeyva @juanarbol
os: avoid unnecessary usage of var
0fcb067 
The `var` keyword is known to be problematic and is not needed here,
so better to use the `let` keyword for variable declarations.

PR-URL: nodejs#42563
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Akhil Marsonya <akhil.marsonya27@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
This was referenced Apr 5, 2022
Closed
Merged
juanarbol pushed a commit that referenced this pull request Apr 6, 2022
@VoltrexKeyva @juanarbol
os: avoid unnecessary usage of var
0bd9d9e 
The `var` keyword is known to be problematic and is not needed here,
so better to use the `let` keyword for variable declarations.

PR-URL: #42563
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Akhil Marsonya <akhil.marsonya27@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
xtx1130 pushed a commit to xtx1130/node that referenced this pull request Apr 25, 2022
@VoltrexKeyva @xtx1130
os: avoid unnecessary usage of var
966f02c 
The `var` keyword is known to be problematic and is not needed here,
so better to use the `let` keyword for variable declarations.

PR-URL: nodejs#42563
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Akhil Marsonya <akhil.marsonya27@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
juanarbol pushed a commit that referenced this pull request May 31, 2022
@VoltrexKeyva @juanarbol
os: avoid unnecessary usage of var
2cf6a05 
The `var` keyword is known to be problematic and is not needed here,
so better to use the `let` keyword for variable declarations.

PR-URL: #42563
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Akhil Marsonya <akhil.marsonya27@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
@juanarbol juanarbol mentioned this pull request May 31, 2022
Closed
danielleadams pushed a commit that referenced this pull request Jun 27, 2022
@VoltrexKeyva @danielleadams
os: avoid unnecessary usage of var
6216279 
The `var` keyword is known to be problematic and is not needed here,
so better to use the `let` keyword for variable declarations.

PR-URL: #42563
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Akhil Marsonya <akhil.marsonya27@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
targos pushed a commit that referenced this pull request Jul 11, 2022
@VoltrexKeyva @targos
os: avoid unnecessary usage of var
1161ff8 
The `var` keyword is known to be problematic and is not needed here,
so better to use the `let` keyword for variable declarations.

PR-URL: #42563
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Akhil Marsonya <akhil.marsonya27@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
targos pushed a commit that referenced this pull request Jul 31, 2022
@VoltrexKeyva @targos
os: avoid unnecessary usage of var
e7899ba 
The `var` keyword is known to be problematic and is not needed here,
so better to use the `let` keyword for variable declarations.

PR-URL: #42563
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Akhil Marsonya <akhil.marsonya27@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
@targos targos mentioned this pull request Aug 3, 2022
Merged
guangwong pushed a commit to noslate-project/node that referenced this pull request Oct 10, 2022
@VoltrexKeyva @guangwong
os: avoid unnecessary usage of var
a2a97b3 
The `var` keyword is known to be problematic and is not needed here,
so better to use the `let` keyword for variable declarations.

PR-URL: nodejs/node#42563
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Akhil Marsonya <akhil.marsonya27@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
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@jasnell jasnell jasnell approved these changes

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