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util: improve util.inspect performance #14492

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BridgeAR wants to merge 6 commits into from
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util: improve util.inspect performance #14492

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ddd4de4
util: use for in instead of while hasOwnProperty
BridgeAR Jul 26, 2017
b73a399
util: use faster visibleKeys property lookup
BridgeAR Jul 26, 2017
ab497df
fixup
BridgeAR Jul 26, 2017
61119e4
fixup comments commit 1
BridgeAR Jul 27, 2017
a2574f0
fixup commit 1
BridgeAR Jul 28, 2017
4aed280
benchmarks: add inspect-array benchmark
BridgeAR Jul 28, 2017
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fixup commit 1
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@BridgeAR
BridgeAR committed Jul 28, 2017
commit a2574f0bc5571997134532723bc2ee43bf349c0f
5 changes: 4 additions & 1 deletion lib/util.js
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Original file line number Diff line number Diff line change
Expand Up @@ -671,9 +671,12 @@ function formatArray(ctx, value, recurseTimes, visibleKeys, keys) {
var output = [];
let visibleLength = 0;
let index = 0;
for (const elem in value) {
for (const elem of keys) {
if (visibleLength === ctx.maxArrayLength)
break;
// Symbols might have been added to the keys
if (typeof elem !== 'string')
continue;
const i = +elem;
if (index !== i) {
// Skip zero and negative numbers as well as non numbers
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8 changes: 8 additions & 0 deletions test/parallel/test-util-inspect.js
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Expand Up @@ -310,6 +310,14 @@ assert.strictEqual(
'[ 1, 2, 3, growingLength: [Getter], \'-1\': -1 ]');
}

// Array with inherited number properties
{
class CustomArray extends Array {};
CustomArray.prototype[5] = 'foo';
const arr = new CustomArray(50);
assert.strictEqual(util.inspect(arr), 'CustomArray [ <50 empty items> ]');
}

// Function with properties
{
const value = () => {};
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