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assert: handle sparse arrays in deepStrictEqual #15027

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assert: handle sparse arrays in deepStrictEqual #15027

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assert: handle sparse arrays in deepStrictEqual 
Detect sparse array ends and add a fail early path for
unequal array length.
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@BridgeAR
BridgeAR committed Aug 25, 2017
commit 8bf73ff9a10cca20e884b097edc9597ffbd1bdd0
9 changes: 8 additions & 1 deletion lib/assert.js
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Original file line number Diff line number Diff line change
Expand Up @@ -182,7 +182,14 @@ function strictDeepEqual(actual, expected) {
if (Object.getPrototypeOf(actual) !== Object.getPrototypeOf(expected)) {
return false;
}
if (isObjectOrArrayTag(actualTag)) {
if (actualTag === '[object Array]') {
// Check for sparse arrays and general fast path
if (actual.length !== expected.length)
return false;
// Skip testing the part below and continue in the callee function.
return;
}
if (actualTag === '[object Object]') {
// Skip testing the part below and continue in the callee function.
return;
}
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3 changes: 3 additions & 0 deletions test/parallel/test-assert-deep.js
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Expand Up @@ -466,4 +466,7 @@ assertOnlyDeepEqual(
assertDeepAndStrictEqual(m3, m4);
}

assertDeepAndStrictEqual([1, , , 3], [1, , , 3]);
assertOnlyDeepEqual([1, , , 3], [1, , , 3, , , ]);

/* eslint-enable */