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util: use ES2015+ Object.is to check negative zero #11332

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util: use ES2015+ Object.is to check negative zero #11332

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shinnn
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@shinnn shinnn commented Feb 13, 2017

The original code is written in 2013. Today we can use more simple way Object.is, which was introduced in ECMAScript 6, to check whether the value is negative zero or not.

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • commit message follows commit guidelines
Affected core subsystem(s)

util

@nodejs-github-bot nodejs-github-bot added the util Issues and PRs related to the built-in util module. label Feb 13, 2017
mscdex
mscdex reviewed Feb 13, 2017
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lib/util.js Outdated
@@ -603,8 +603,7 @@ function formatValue(ctx, value, recurseTimes) {

function formatNumber(ctx, value) {
// Format -0 as '-0'. Strict equality won't distinguish 0 from -0,
// so instead we use the fact that 1 / -0 < 0 whereas 1 / 0 > 0 .
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The removal of this line leaves the sentence from the previous line incomplete.

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Thanks. I missed the last comma (not a period) in the previous line.

@shinnn
util: use ES2015+ Object.is to check negative zero
4d9579c 
The original code nodejs@b3e4fc6 is written in 2013. Today we can use more simple way `Object.is`, which was introduced in ECMAScript 6, to check whether the value is negative zero or not.
bnoordhuis
bnoordhuis approved these changes Feb 13, 2017
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LGTM. CI: https://ci.nodejs.org/job/node-test-pull-request/6371/

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@shinnn By the way, did you check that the benchmarks in benchmark/util didn't regress?

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shinnn commented Feb 13, 2017 •
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did you check that the benchmarks in benchmark/util didn't regress?

On my machine,

# before
util/inspect.js n=5000000: 34,926.911787501784

# after
util/inspect.js n=5000000: 34,675.27026138018

However, I guess this change doesn't actually affect the existing util.inspect benchmark because the test fixture doesn't include any numbers.

node/benchmark/util/inspect.js

Line 13 in dcfda10

util.inspect({a: 'a', b: 'b', c: 'c', d: 'd'});

evanlucas
evanlucas approved these changes Feb 13, 2017
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LGTM and test/parallel/test-util-inspect.js already has a test for this. Thanks!

jasnell pushed a commit that referenced this pull request Feb 16, 2017
@shinnn @jasnell
util: use ES2015+ Object.is to check negative zero
5ddf722 
Use `Object.is` to check whether the value is negative zero or not.

Ref: b3e4fc6
PR-URL: #11332
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
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jasnell commented Feb 16, 2017

Landed in 5ddf722

@jasnell jasnell closed this Feb 16, 2017
italoacasas pushed a commit to italoacasas/node that referenced this pull request Feb 20, 2017
@shinnn @italoacasas
util: use ES2015+ Object.is to check negative zero
271047a 
Use `Object.is` to check whether the value is negative zero or not.

Ref: nodejs@b3e4fc6
PR-URL: nodejs#11332
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
italoacasas pushed a commit that referenced this pull request Feb 22, 2017
@shinnn @italoacasas
util: use ES2015+ Object.is to check negative zero
3bdac54 
Use `Object.is` to check whether the value is negative zero or not.

Ref: b3e4fc6
PR-URL: #11332
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
@italoacasas italoacasas mentioned this pull request Feb 25, 2017
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jasnell commented Mar 7, 2017

This would need a backport PR to land in v4

jasnell pushed a commit that referenced this pull request Mar 7, 2017
@shinnn @jasnell
util: use ES2015+ Object.is to check negative zero
1ace4e2 
Use `Object.is` to check whether the value is negative zero or not.

Ref: b3e4fc6
PR-URL: #11332
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
MylesBorins pushed a commit that referenced this pull request Mar 9, 2017
@shinnn @MylesBorins
util: use ES2015+ Object.is to check negative zero
e54b433 
Use `Object.is` to check whether the value is negative zero or not.

Ref: b3e4fc6
PR-URL: #11332
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
@MylesBorins MylesBorins mentioned this pull request Mar 9, 2017
Merged
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@mscdex mscdex mscdex left review comments

@joyeecheung joyeecheung joyeecheung approved these changes

@cjihrig cjihrig cjihrig approved these changes

@targos targos targos approved these changes

@lpinca lpinca lpinca approved these changes

@thefourtheye thefourtheye thefourtheye approved these changes

@evanlucas evanlucas evanlucas approved these changes

@jasnell jasnell jasnell approved these changes

@bnoordhuis bnoordhuis bnoordhuis approved these changes

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