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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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7 changes: 5 additions & 2 deletions lib/util.js
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Original file line number Diff line number Diff line change
Expand Up @@ -371,10 +371,13 @@ function formatValue(ctx, value, recurseTimes) {
// Look up the keys of the object.
var keys = Object.keys(value);
var visibleKeys = arrayToHash(keys);
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I don't fully understand what goes on with keys vs. visibleKeys, yet, this seems to work.

const symbolKeys = Object.getOwnPropertySymbols(value);
const enumSymbolKeys = symbolKeys
.filter((key) => value.propertyIsEnumerable(key));
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@TimothyGu TimothyGu Feb 7, 2017 •
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This would break if value does not inherit from Object.prototype. Object.getOwnPropertyDescriptor(value, key).enumerable should work.

keys = keys.concat(enumSymbolKeys);

if (ctx.showHidden) {
keys = Object.getOwnPropertyNames(value);
keys = keys.concat(Object.getOwnPropertySymbols(value));
keys = Object.getOwnPropertyNames(value).concat(symbolKeys);
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This is the same result. The change is to not get the symbols twice.

}

// This could be a boxed primitive (new String(), etc.), check valueOf()
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20 changes: 15 additions & 5 deletions test/parallel/test-util-inspect.js
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Expand Up @@ -588,8 +588,9 @@ assert.doesNotThrow(function() {
'{ a: 123, inspect: [Function: inspect] }');

const subject = { a: 123, [util.inspect.custom]() { return this; } };
const UIC = 'util.inspect.custom';
assert.strictEqual(util.inspect(subject),
'{ a: 123 }');
`{ a: 123,\n [Symbol(${UIC})]: [Function: [${UIC}]] }`);
}

// util.inspect with "colors" option should produce as many lines as without it
Expand Down Expand Up @@ -659,18 +660,27 @@ if (typeof Symbol !== 'undefined') {

subject[Symbol('symbol')] = 42;

assert.strictEqual(util.inspect(subject), '{}');
assert.strictEqual(util.inspect(subject), '{ [Symbol(symbol)]: 42 }');
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This demonstrates the change.

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@mightyiam mightyiam Nov 21, 2016 •
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Just the way I like it 😉

assert.strictEqual(
util.inspect(subject, options),
'{ [Symbol(symbol)]: 42 }'
);

Object.defineProperty(
subject,
Symbol(),
{enumerable: false, value: 'non-enum'});
assert.strictEqual(util.inspect(subject), '{ [Symbol(symbol)]: 42 }');
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@mightyiam mightyiam Nov 21, 2016 •
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This assertion is removed because we already have an assertion above that symbol key properties are visible with showHidden.

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

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

assert.strictEqual(util.inspect(subject), '[ 1, 2, 3 ]');
assert.strictEqual(util.inspect(subject, options),
'[ 1, 2, 3, [length]: 3, [Symbol(symbol)]: 42 ]');
assert.strictEqual(util.inspect(subject),
'[ 1, 2, 3, [Symbol(symbol)]: 42 ]');
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So in essence, this assertion is not instead of the one in 672, but instead of the one in 671. I guess it shows that symbol key properties can coexist peacefully with other properties in inspection. Or something about the order of properties? In any case, I'm guessing that the essence is preserved.

}

// test Set
Expand Down