assert: fix _deepEqual and improve assert.md #11128

joyeecheung · 2017-02-02T22:39:03Z

This is the more semver-patch part of #10282.

Fix _deepEqual

Refactors _deepEqual and fixes a few code paths that lead to
behaviors contradicting what the doc says. Before this commit
certain types of objects (Buffers, Dates, etc.) are not checked
properly, and can get away with different prototypes AND different
enumerable owned properties because _deepEqual would jump to
premature conclusion for them.

Since we no longer follow CommonJS unit testing spec,
the checks for primitives and object prototypes are moved
forward for faster failure.

Improve regexp and float* array checks:

Don't compare lastIndex of regexps, because they are not
enumerable, so according to the docs they should not be compared
Compare flags of regexps instead of separate properties
Use built-in tags to test for float* arrays instead of using
instanceof

Refs: #10282 (comment)
Refs: #10258 (comment)

Improve documentation

Use the term "Abstract Equality Comparison" and "Strict Equality
Comparison" from ECMAScript specification to refer to the operations
done by == and ===, instead of the informal
"equal comparison operator" and "strict equality operator".

Clarify that deep strict comparisons checks [[Prototype]]
property, instead of the vague "object prototypes".

Suggest using Object.is() to avoid the caveats of +0, -0 and NaN.

Add a MDN link explaining what enumerable "own" properties are.

Checklist

make -j4 test (UNIX), or vcbuild test (Windows) passes
tests and/or benchmarks are included
documentation is changed or added
commit message follows commit guidelines

Affected core subsystem(s)

test, assert, doc

joyeecheung · 2017-02-02T23:11:24Z

CI: https://ci.nodejs.org/job/node-test-pull-request/6178/
CITGM: https://ci.nodejs.org/view/Node.js-citgm/job/citgm-smoker/562/

joyeecheung · 2017-02-02T23:31:38Z

Benchmarks results (benchmarks taken from #11092). Note that this implementation favors fast failures, though failures are not benchmarked(when an assertion fails the process should probably be terminated anyway).

see results

                                                                                                  improvement confidence      p.value
 assert/deepequal-buffer.js method="nonstrict" len=100 n=1000                                        -92.69 %        *** 1.398352e-10
 assert/deepequal-buffer.js method="strict" len=100 n=1000                                           -87.27 %        *** 8.988908e-07
 assert/deepequal-prims-and-objs-big-array.js method="nonstrict" len=100000 n=25 prim="array"          0.52 %            5.671380e-01
 assert/deepequal-prims-and-objs-big-array.js method="nonstrict" len=100000 n=25 prim="boolean"        1.33 %            3.162478e-01
 assert/deepequal-prims-and-objs-big-array.js method="nonstrict" len=100000 n=25 prim="new-array"      1.39 %          * 2.256608e-02
 assert/deepequal-prims-and-objs-big-array.js method="nonstrict" len=100000 n=25 prim="null"           1.12 %            1.546353e-01
 assert/deepequal-prims-and-objs-big-array.js method="nonstrict" len=100000 n=25 prim="number"        -0.52 %            7.352546e-01
 assert/deepequal-prims-and-objs-big-array.js method="nonstrict" len=100000 n=25 prim="object"        -0.53 %            5.363293e-01
 assert/deepequal-prims-and-objs-big-array.js method="nonstrict" len=100000 n=25 prim="string"         0.48 %            5.514581e-01
 assert/deepequal-prims-and-objs-big-array.js method="nonstrict" len=100000 n=25 prim="undefined"      0.70 %            2.601707e-01
 assert/deepequal-prims-and-objs-big-array.js method="strict" len=100000 n=25 prim="array"             0.59 %            4.341103e-01
 assert/deepequal-prims-and-objs-big-array.js method="strict" len=100000 n=25 prim="boolean"           1.73 %         ** 9.211000e-03
 assert/deepequal-prims-and-objs-big-array.js method="strict" len=100000 n=25 prim="new-array"         1.30 %            1.185455e-01
 assert/deepequal-prims-and-objs-big-array.js method="strict" len=100000 n=25 prim="null"              0.68 %            3.269869e-01
 assert/deepequal-prims-and-objs-big-array.js method="strict" len=100000 n=25 prim="number"           -2.51 %            5.382094e-02
 assert/deepequal-prims-and-objs-big-array.js method="strict" len=100000 n=25 prim="object"            2.23 %            8.626440e-02
 assert/deepequal-prims-and-objs-big-array.js method="strict" len=100000 n=25 prim="string"            0.20 %            7.698036e-01
 assert/deepequal-prims-and-objs-big-array.js method="strict" len=100000 n=25 prim="undefined"         0.86 %            3.789055e-01
 assert/deepequal-prims-and-objs-big-loop.js method="nonstrict" n=1000000 prim="array"                 6.32 %        *** 4.516185e-04
 assert/deepequal-prims-and-objs-big-loop.js method="nonstrict" n=1000000 prim="boolean"               9.25 %        *** 8.115494e-05
 assert/deepequal-prims-and-objs-big-loop.js method="nonstrict" n=1000000 prim="new-array"             9.36 %        *** 7.678773e-05
 assert/deepequal-prims-and-objs-big-loop.js method="nonstrict" n=1000000 prim="null"                  9.41 %        *** 2.294144e-04
 assert/deepequal-prims-and-objs-big-loop.js method="nonstrict" n=1000000 prim="number"                5.07 %          * 3.376728e-02
 assert/deepequal-prims-and-objs-big-loop.js method="nonstrict" n=1000000 prim="object"                4.23 %            1.091126e-01
 assert/deepequal-prims-and-objs-big-loop.js method="nonstrict" n=1000000 prim="string"                6.42 %        *** 5.440464e-04
 assert/deepequal-prims-and-objs-big-loop.js method="nonstrict" n=1000000 prim="undefined"             8.15 %         ** 4.303777e-03
 assert/deepequal-prims-and-objs-big-loop.js method="strict" n=1000000 prim="array"                    6.60 %          * 1.017124e-02
 assert/deepequal-prims-and-objs-big-loop.js method="strict" n=1000000 prim="boolean"                  8.82 %        *** 6.257818e-05
 assert/deepequal-prims-and-objs-big-loop.js method="strict" n=1000000 prim="new-array"               11.13 %        *** 6.845735e-04
 assert/deepequal-prims-and-objs-big-loop.js method="strict" n=1000000 prim="null"                     8.88 %        *** 1.083174e-04
 assert/deepequal-prims-and-objs-big-loop.js method="strict" n=1000000 prim="number"                   4.29 %            2.310841e-01
 assert/deepequal-prims-and-objs-big-loop.js method="strict" n=1000000 prim="object"                   7.70 %        *** 2.296652e-04
 assert/deepequal-prims-and-objs-big-loop.js method="strict" n=1000000 prim="string"                   9.81 %        *** 1.067824e-06
 assert/deepequal-prims-and-objs-big-loop.js method="strict" n=1000000 prim="undefined"               13.05 %        *** 1.293929e-05
 assert/deepequal-typedarrays.js len=1000000 method="nonstrict" n=1 type="Float32Array"                0.45 %            6.665986e-01
 assert/deepequal-typedarrays.js len=1000000 method="nonstrict" n=1 type="Float64Array"                1.62 %            1.182916e-01
 assert/deepequal-typedarrays.js len=1000000 method="nonstrict" n=1 type="Int16Array"                -98.85 %        *** 6.838162e-11
 assert/deepequal-typedarrays.js len=1000000 method="nonstrict" n=1 type="Int32Array"                -98.02 %        *** 1.541802e-11
 assert/deepequal-typedarrays.js len=1000000 method="nonstrict" n=1 type="Int8Array"                 -99.33 %        *** 1.169792e-12
 assert/deepequal-typedarrays.js len=1000000 method="nonstrict" n=1 type="Uint16Array"               -98.88 %        *** 1.836848e-11
 assert/deepequal-typedarrays.js len=1000000 method="nonstrict" n=1 type="Uint32Array"               -97.99 %        *** 7.248263e-13
 assert/deepequal-typedarrays.js len=1000000 method="nonstrict" n=1 type="Uint8Array"                -99.32 %        *** 3.145163e-11
 assert/deepequal-typedarrays.js len=1000000 method="nonstrict" n=1 type="Uint8ClampedArray"         -99.30 %        *** 5.984442e-12
 assert/deepequal-typedarrays.js len=1000000 method="strict" n=1 type="Float32Array"                   0.78 %            4.221460e-01
 assert/deepequal-typedarrays.js len=1000000 method="strict" n=1 type="Float64Array"                  -0.08 %            9.232714e-01
 assert/deepequal-typedarrays.js len=1000000 method="strict" n=1 type="Int16Array"                    -6.42 %            7.496064e-02
 assert/deepequal-typedarrays.js len=1000000 method="strict" n=1 type="Int32Array"                    -0.20 %            9.728131e-01
 assert/deepequal-typedarrays.js len=1000000 method="strict" n=1 type="Int8Array"                     -5.38 %            5.518969e-01
 assert/deepequal-typedarrays.js len=1000000 method="strict" n=1 type="Uint16Array"                   -6.58 %            2.480984e-01
 assert/deepequal-typedarrays.js len=1000000 method="strict" n=1 type="Uint32Array"                   -4.62 %            1.772045e-01
 assert/deepequal-typedarrays.js len=1000000 method="strict" n=1 type="Uint8Array"                   -10.72 %        *** 1.283864e-04
 assert/deepequal-typedarrays.js len=1000000 method="strict" n=1 type="Uint8ClampedArray"             -0.45 %            8.987984e-01

joyeecheung · 2017-02-03T06:41:14Z

Hmm, canary died but I can't be sure if the failures are related(most are in network-related modules, and node-sass has an error about platform support). @MylesBorins Am I using it properly?

jasnell · 2017-02-03T16:58:55Z

doc/api/assert.md

+
+Only [enumerable "own" properties](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Enumerability_and_ownership_of_properties)
+are considered. The `deepEqual()` implementation does not test the
+[`[[Prototype]]`](https://tc39.github.io/ecma262/#sec-ordinary-object-internal-methods-and-internal-slots)


Please move the link ref to the end of the file and use an inline ref like:

[`[[Prototype]]`][]

I used this but seems GitHub has a little bit trouble with that(I am guessing it's the [[ and ]] somehow confuses its parser?), not sure if the tooling can deal with it?

jasnell · 2017-02-03T16:59:57Z

doc/api/assert.md

+Only [enumerable "own" properties](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Enumerability_and_ownership_of_properties)
+are considered. The `deepEqual()` implementation does not test the
+[`[[Prototype]]`](https://tc39.github.io/ecma262/#sec-ordinary-object-internal-methods-and-internal-slots)
+of objects, attached symbols, or non-enumerable


This line is rather short, can you update this so that the line length is closer to 80

jasnell · 2017-02-03T17:00:47Z

doc/api/assert.md

+
+For the following cases, consider using ES2015 [`Object.is()`][],
+which uses the
+[SameValueZero](https://tc39.github.io/ecma262/#sec-samevaluezero) comparison.


Please move this to a reference at the bottom of the file also. :-)

jasnell · 2017-02-03T17:01:59Z

test/parallel/test-assert-deep.js

+    result += str.replace(/[\\^$.*+?()[\]{}|=!<>:-]/g, '\\$&');
+    result += literals[i + 1];
+  }
+  return new RegExp('^AssertionError: ' + result + '$');


return new RegExp(`^AssertionError: ${result}$`);

joyeecheung · 2017-02-03T18:28:58Z

@jasnell Thanks, PTAL. I am not quite sure about what to do the [[Prototype]] part, because neither the markdown rendering of GitHub nor our tooling can deal with them:

jasnell · 2017-02-03T18:36:32Z

Escape the [ with a \ like so:

[\[\[Prototype\]\]][]

[\[\[Prototype\]\]]: https://example.org/link/to/whatever

For instance: [[Prototype]]

joyeecheung · 2017-02-04T08:01:11Z

Hmm...putting it inside ` still doesn't work:

[`\[\[Prototype\]\]`]: https://tc39.github.io/ecma262/#sec-ordinary-object-internal-methods-and-internal-slots

joyeecheung · 2017-02-06T03:19:21Z

@addaleax @Trott Can you take a look at this if you have time since you've LTGM'ed #10282? Thanks!

ljharb

Same comments as on #10282 - it'd be great to cache everything at module level rather than trusting user-provided objects, or user code, not to have broken something.

ljharb · 2017-02-06T07:47:48Z

lib/assert.js

+}
+
+function isArguments(tag) {
+  return tag == '[object Arguments]';


ljharb · 2017-02-06T07:48:17Z

lib/assert.js

+  // for a list of tags pre-defined in the spec.
+  // There are some unspecified tags in the wild too (e.g. typed array tags).
+  // Since tags can be altered, they only serve fast failures
+  const actualTag = Object.prototype.toString.call(actual);


Same comment as I made in #10282 - Object.prototype.toString should be cached at module level.

joyeecheung · 2017-02-06T08:12:04Z

(I think the discussion about @ljharb 's comments can be moved here since those commented code is intended to be merged by this PR)

I am +1-ish on caching Object.prototype.toString and Object.keys for robustness, but I think this should be better pursued in a separate PR because this practice should be consistent across different lib modules, especially in util.objectToString(just discovered it), unless we have to avoid it for other reasons e.g. performance hit.

In the meantime I'll change Object.prototype.toString.call in this PR to use util.objectToString instead.

joyeecheung · 2017-02-09T17:09:04Z

Rebased and, ah...right, I was being silly, the [[Prototype]] link can be easily fixed by using named reference links :P @jasnell PTAL.

joyeecheung · 2017-02-15T11:53:39Z

Pinging @jasnell @Trott @addaleax for more reviews, thanks!

jasnell

Code looks good but doc needs a few tweaks.

jasnell · 2017-02-15T17:16:50Z

doc/api/assert.md

+Primitive values are compared with the [Abstract Equality Comparison][]
+( `==` ).
+
+Only [enumerable "own" properties](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Enumerability_and_ownership_of_properties)


Please move the link to the bottom and use an inline reference like [enumerable "own" properties][] to avoid having the over-long line

jasnell · 2017-02-15T17:17:20Z

doc/api/assert.md

+[`[[Prototype]]`][prototype-spec] of objects, attached symbols, or
+non-enumerable properties (for those checks, consider using
+[`assert.deepStrictEqual()`][] instead). This can lead to some
+potentially surprising results. For example, the following example does no


s/does no/does not (end of the line)

jasnell · 2017-02-15T17:18:04Z

doc/api/assert.md

+
+For the following cases, consider using ES2015 [`Object.is()`][],
+which uses the
+[SameValueZero][] comparison.


Move this up to the previous line :-)

jasnell · 2017-02-15T17:18:59Z

doc/api/assert.md

+```
+
+For more information, see
+[MDN's guide on equality comparisons and sameness](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Equality_comparisons_and_sameness).


Even tho this is at the end of the file, please move the link to the index at the end and use an inline reference for this as well, just for consistency :-)

Trott

One minor doc nit, but otherwise LGTM if CI is green and a CITGM run doesn't reveal anything alarming.

joyeecheung · 2017-02-17T16:05:08Z

Punctuation fixed, thanks! @Trott

CI: https://ci.nodejs.org/job/node-test-pull-request/6473/

joyeecheung · 2017-02-17T16:08:29Z

Recent CITGM jobs are all red, launched https://ci.nodejs.org/job/citgm-smoker/582/ against master and https://ci.nodejs.org/job/citgm-smoker/583/ against this PR for comparison.

jasnell · 2017-02-17T16:12:57Z

doc/api/assert.md

-because the properties on the [`Error`][] object are non-enumerable:
+Only [enumerable "own" properties][] are considered. The `deepEqual()`
+implementation does not test the [`[[Prototype]]`][prototype-spec] of
+objects, attached symbols, or non-enumerable properties. (For those checks,


Just spotted this... can you actually remove the parens in this sentence. It can be reworded slightly as:

Only [enumerable "own" properties][] are considered. The `deepEqual()` implementation does not test the [`[[Prototype]]`][prototype-spec] of objects, attached symbols, or non-enumerable properties — for such checks, consider using [assert.deepStrictEqual()][] instead.

Also, using deepEqual() in one sentence and assert.deepStrictEqual() in another is a bit inconsistent. Consider either using the assert. in both or omitting it from both.

Oh yes, I was thinking parens look a bit awkward too, the hyphen does the trick!
I'll use assert.deepEqual() because it has a link already. Thanks!

targos · 2017-02-18T12:42:24Z

doc/api/assert.md

+[Abstract Equality Comparison]: https://tc39.github.io/ecma262/#sec-abstract-equality-comparison
+[Strict Equality Comparison]: https://tc39.github.io/ecma262/#sec-strict-equality-comparison
+[`Object.is()`]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is
+[SameValueZero]: https://tc39.github.io/ecma262/#sec-SameValueZero


nit: #sec-samevaluezero

targos · 2017-02-18T12:48:02Z

doc/api/assert.md

+For more information, see
+[MDN's guide on equality comparisons and sameness][mdn-equality-guide].
+
+[Locked]: documentation.html#documentation_stability_index


this link is unused

joyeecheung · 2017-02-18T16:30:38Z

@targos Thanks for the review, updated.

New CI: https://ci.nodejs.org/job/node-test-pull-request/6492/

The CITGM for the last code change has the same amount of failure as master ( (27 failures / ±0)), not sure if we can rely on this though...

joyeecheung · 2017-02-24T03:48:05Z

Hmm..don't know what else does this PR need to land? CITGM is 27 failures and ±0 compared to its master.

addaleax · 2017-02-24T14:38:52Z

@joyeecheung I don’t think there’s anything speaking against landing it. :)

joyeecheung · 2017-02-24T15:09:02Z

@addaleax Alright, gonna land this tomorrow :) Thanks

Trott · 2017-02-25T00:42:20Z

FYI, needs a rebase thanks to a PR I just landed.

Trott · 2017-02-25T00:44:13Z

lib/assert.js


-function objEquiv(a, b, strict, actualVisitedObjects) {
-  if (a === null || a === undefined || b === null || b === undefined)
+  // GH-7178. Ensure reflexivity of deepEqual with `arguments` objects.


This is probably a good time to change that GH reference to a full URL. Generally a good idea, but especially here since it's not in this repository, but in the archive one instead:

nodejs/node-v0.x-archive#7178

Yep, I'll update those links, thanks!

Trott · 2017-02-25T00:44:42Z

test/parallel/test-assert-deep.js

+  new Int32Array([1]), // Int32Array
+  new Uint32Array([1]), // Uint32Array
+  Buffer.from([1]),
+  // Arguments {'0': '1'} is not here, see GH-7178


Same here, full URL would be helpful: nodejs/node-v0.x-archive#7178

Refactors _deepEqual and fixes a few code paths that lead to behaviors contradicting what the doc says. Before this commit certain types of objects (Buffers, Dates, etc.) are not checked properly, and can get away with different prototypes AND different enumerable owned properties because _deepEqual would jump to premature conclusion for them. Since we no longer follow CommonJS unit testing spec, the checks for primitives and object prototypes are moved forward for faster failure. Improve regexp and float* array checks: * Don't compare lastIndex of regexps, because they are not enumerable, so according to the docs they should not be compared * Compare flags of regexps instead of separate properties * Use built-in tags to test for float* arrays instead of using instanceof Use full link to the archived GitHub repository. Use util.objectToString for future improvements to that function that makes sure the call won't be tampered with. Refs: nodejs#10282 (comment) Refs: nodejs#10258 (comment)

Use the term "Abstract Equality Comparison" and "Strict Equality Comparison" from ECMAScript specification to refer to the operations done by `==` and `===`, instead of "equal comparison operator" and "strict equality operator". Clarify that deep strict comparisons checks `[[Prototype]]` property, instead of the vague "object prototypes". Suggest using `Object.is()` to avoid the caveats of +0, -0 and NaN. Add a MDN link explaining what enumerable "own" properties are.

joyeecheung · 2017-02-25T06:37:51Z

Rebased and squashed with full github links added.

New CI: https://ci.nodejs.org/job/node-test-pull-request/6583/
CITGM against master: https://ci.nodejs.org/view/Node.js-citgm/job/citgm-smoker/599/
CITGM against this PR: https://ci.nodejs.org/view/Node.js-citgm/job/citgm-smoker/600/

gibfahn · 2017-02-25T09:40:59Z

@nodejs/citgm do these failures look reasonable?

joyeecheung · 2017-02-25T12:43:16Z

This is weird, the CITGM against this PR is (18 failures / -11), less failures than the master...is it just flakiness?

joyeecheung · 2017-02-26T05:03:09Z

Not sure why CITGM got less errors with this PR, but according previous results I am pretty sure it's not related to the code change here. I am going to land this tomorrow if no more concerns arise...

jasnell · 2017-02-27T00:53:40Z

CITGM and CI look fine. I've seen flakiness like that before.

joyeecheung · 2017-02-27T10:37:55Z

Landed in 562cf5a and 3d8379a, thanks!

Refactors _deepEqual and fixes a few code paths that lead to behaviors contradicting what the doc says. Before this commit certain types of objects (Buffers, Dates, etc.) are not checked properly, and can get away with different prototypes AND different enumerable owned properties because _deepEqual would jump to premature conclusion for them. Since we no longer follow CommonJS unit testing spec, the checks for primitives and object prototypes are moved forward for faster failure. Improve regexp and float* array checks: * Don't compare lastIndex of regexps, because they are not enumerable, so according to the docs they should not be compared * Compare flags of regexps instead of separate properties * Use built-in tags to test for float* arrays instead of using instanceof Use full link to the archived GitHub repository. Use util.objectToString for future improvements to that function that makes sure the call won't be tampered with. PR-URL: #11128 Refs: #10282 (comment) Refs: #10258 (comment) Reviewed-By: James M Snell <[email protected]> Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Rich Trott <[email protected]> Reviewed-By: Michaël Zasso <[email protected]>

Use the term "Abstract Equality Comparison" and "Strict Equality Comparison" from ECMAScript specification to refer to the operations done by `==` and `===`, instead of "equal comparison operator" and "strict equality operator". Clarify that deep strict comparisons checks `[[Prototype]]` property, instead of the vague "object prototypes". Suggest using `Object.is()` to avoid the caveats of +0, -0 and NaN. Add a MDN link explaining what enumerable "own" properties are. PR-URL: #11128 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Rich Trott <[email protected]> Reviewed-By: Michaël Zasso <[email protected]>

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joyeecheung changed the title ~~assert: refactor assert and improve assert.md~~ assert: refactor _deepEqual and improve assert.md Feb 2, 2017

joyeecheung changed the title ~~assert: refactor _deepEqual and improve assert.md~~ assert: fix _deepEqual and improve assert.md Feb 2, 2017

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assert: fix _deepEqual and improve assert.md #11128

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joyeecheung commented Feb 2, 2017 • edited Loading

Fix _deepEqual

Improve documentation

Checklist

Affected core subsystem(s)

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