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Symbol key props visible in inspection by default #9726

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Symbol key props visible in inspection by default #9726

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903f353
Symbol key props visible in inspection by default
mightyiam Nov 21, 2016
192d79a
test/parallel/test-util-inspect: const UTC -> const UIC
mightyiam Nov 22, 2016
3ace6a9
Excl. non-enumerable property symbols from inspection by default
mightyiam Nov 24, 2016
8e73c95
lib/util: use const for symbolKeys & enumSymbolKeys
mightyiam Nov 24, 2016
3cbd847
lib/util: fix indentation of enumSymbolKeys's filter call
mightyiam Nov 24, 2016
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Excl. non-enumerable property symbols from inspection by default 
Including test
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@mightyiam
mightyiam committed Nov 24, 2016
commit 3ace6a901ea89156888f3c5b44063d37ef291f69
4 changes: 3 additions & 1 deletion lib/util.js
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Expand Up @@ -372,7 +372,9 @@ function formatValue(ctx, value, recurseTimes) {
var keys = Object.keys(value);
var visibleKeys = arrayToHash(keys);
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@mightyiam mightyiam Nov 21, 2016

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I don't fully understand what goes on with keys vs. visibleKeys, yet, this seems to work.

var symbolKeys = Object.getOwnPropertySymbols(value);
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@addaleax addaleax Nov 22, 2016

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I haven’t run this but right now this looks like this will include even *non-*enumerable Symbol properties?

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@mightyiam mightyiam Nov 22, 2016

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Yup. That is how Object.getOwnPropertySymbols works. It is like the conversation between it and Object.getOwnPropertyNames is:

  • Object.getOwnPropertyNames: Hey, Symbol. You may join. But don't expect me to list you, even if you're enumerable...
  • Symbol: 😐
  • Object.getOwnPropertySymbols: Gee, did you see that guy? Tell you what, Symbol. I'll list all of you, regardless!
  • Symbol: 😟
  • Object.getOwnPropertyNames: 😦
  • Object.getOwnPropertySymbols: 😊
  • Symbol: 😕

I wouldn't mind changing it to exclude non-enumerable symbol-keyed props. Should I?

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@addaleax addaleax Nov 22, 2016

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Well… it seems a bit weird to list only enumerable string properties but all Symbol properties by default?

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@mightyiam mightyiam Nov 22, 2016

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I just don't know the reasons for not listing non-enumerable properties. For the sake of explaining my experience with the matter, I'll testify that I:

  1. never made a property non-enumerable before examining this issue
  2. never had to examine the non-enumerable properties of an object. At least not that I know of.

So, it may help that one with experience with the topic of enumerability and non-enumerability will share his thoughts. Also, the thoughts of one who knows the intention of symbols in this regard and why this is the behavior of Object.getOwnPropertySymbols.

keys = keys.concat(symbolKeys);
var enumSymbolKeys = symbolKeys
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@addaleax addaleax Nov 24, 2016

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nit: This one can be const

.filter((key) => value.propertyIsEnumerable(key));
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@addaleax addaleax Nov 24, 2016

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nit: I think we generally indent statement continuations by 4 spaces, not 2

keys = keys.concat(enumSymbolKeys);

if (ctx.showHidden) {
keys = Object.getOwnPropertyNames(value).concat(symbolKeys);
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@mightyiam mightyiam Nov 21, 2016

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This is the same result. The change is to not get the symbols twice.

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10 changes: 10 additions & 0 deletions test/parallel/test-util-inspect.js
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Expand Up @@ -666,6 +666,16 @@ if (typeof Symbol !== 'undefined') {
'{ [Symbol(symbol)]: 42 }'
);

Object.defineProperty(
subject,
Symbol(),
{enumerable: false, value: 'non-enum'});
assert.strictEqual(util.inspect(subject), '{ [Symbol(symbol)]: 42 }');
assert.strictEqual(
util.inspect(subject, options),
'{ [Symbol(symbol)]: 42, [Symbol()]: \'non-enum\' }'
);

subject = [1, 2, 3];
subject[Symbol('symbol')] = 42;

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