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LibJS: Use element index as key for array spread in object

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This fixes spreading of arrays with holes in object literals where the
inserted keys are not consecutive numbers.

Fixes #3967.
This commit is contained in:
Linus Groh 2020-11-06 22:49:36 +00:00 • committed by Andreas Kling
parent 06a3625545
commit 745ffca580
Notes: sideshowbarker 2024-07-19 01:32:13 +09:00
2 changed files with 6 additions and 1 deletions
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2
Libraries/LibJS/AST.cpp
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@ -1552,7 +1552,7 @@ Value ObjectExpression::execute(Interpreter& interpreter, GlobalObject& global_o
if (key.is_array()) {
auto& array_to_spread = static_cast<Array&>(key.as_object());
for (auto& entry : array_to_spread.indexed_properties()) {
object->indexed_properties().append(entry.value_and_attributes(&array_to_spread).value);
object->indexed_properties().put(object, entry.index(), entry.value_and_attributes(&array_to_spread).value);
if (interpreter.exception())
return {};
}

5
Libraries/LibJS/Tests/object-spread.js
View file

@ -53,6 +53,11 @@ test("spread array in object literal", () => {
testObjStrSpread(obj);
});
test("spread array with holes in object literal", () => {
const obj = { ...[, , "a", , , , "b", "c", , "d", , ,] };
expect(obj).toEqual({ 2: "a", 6: "b", 7: "c", 9: "d" });
});
test("spread string object in object literal", () => {
const obj = { ...String("abcd") };
testObjStrSpread(obj);