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LibJS: Implement Object.assign()
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parent
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commit
7e1bffdeb8
Notes:
sideshowbarker
2024-07-18 12:22:21 +09:00
@ -56,6 +56,7 @@ namespace JS {
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P(asin) \
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P(asinh) \
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P(assert) \
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P(assign) \
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P(at) \
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P(atan) \
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P(atan2) \
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@ -46,6 +46,7 @@ void ObjectConstructor::initialize(GlobalObject& global_object)
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define_native_function(vm.names.entries, entries, 1, attr);
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define_native_function(vm.names.create, create, 2, attr);
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define_native_function(vm.names.hasOwn, has_own, 2, attr);
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define_native_function(vm.names.assign, assign, 2, attr);
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}
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ObjectConstructor::~ObjectConstructor()
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@ -322,4 +323,37 @@ JS_DEFINE_NATIVE_FUNCTION(ObjectConstructor::has_own)
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return Value(object->has_own_property(property_key));
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}
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// 20.1.2.1 Object.assign, https://tc39.es/ecma262/#sec-object.assign
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JS_DEFINE_NATIVE_FUNCTION(ObjectConstructor::assign)
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{
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auto* to = vm.argument(0).to_object(global_object);
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if (vm.exception())
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return {};
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if (vm.argument_count() == 1)
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return to;
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for (size_t i = 1; i < vm.argument_count(); ++i) {
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auto next_source = vm.argument(i);
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if (next_source.is_nullish())
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continue;
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auto from = next_source.to_object(global_object);
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VERIFY(!vm.exception());
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auto keys = from->get_own_properties(PropertyKind::Key);
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if (vm.exception())
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return {};
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for (auto& key : keys) {
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auto property_name = PropertyName::from_value(global_object, key);
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auto property_descriptor = from->get_own_property_descriptor(property_name);
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if (!property_descriptor.has_value() || !property_descriptor->attributes.is_enumerable())
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continue;
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auto value = from->get(property_name);
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if (vm.exception())
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return {};
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to->put(property_name, value);
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if (vm.exception())
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return {};
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}
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}
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return to;
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}
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}
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@ -43,6 +43,7 @@ private:
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JS_DECLARE_NATIVE_FUNCTION(entries);
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JS_DECLARE_NATIVE_FUNCTION(create);
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JS_DECLARE_NATIVE_FUNCTION(has_own);
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JS_DECLARE_NATIVE_FUNCTION(assign);
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};
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}
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@ -0,0 +1,42 @@
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test("length is 2", () => {
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expect(Object.assign).toHaveLength(2);
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});
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describe("errors", () => {
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test("first argument must coercible to object", () => {
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expect(() => {
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Object.assign(null);
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}).toThrowWithMessage(TypeError, "ToObject on null or undefined");
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expect(() => {
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Object.assign(undefined);
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}).toThrowWithMessage(TypeError, "ToObject on null or undefined");
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});
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});
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describe("normal behavior", () => {
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test("returns first argument coerced to object", () => {
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const o = {};
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expect(Object.assign(o)).toBe(o);
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expect(Object.assign(o, {})).toBe(o);
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expect(Object.assign(42)).toEqual(new Number(42));
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});
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test("alters first argument object if sources are given", () => {
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const o = { foo: 0 };
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expect(Object.assign(o, { foo: 1 })).toBe(o);
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expect(o).toEqual({ foo: 1 });
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});
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test("merges objects", () => {
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const s = Symbol();
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expect(
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Object.assign(
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{},
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{ foo: 0, bar: "baz" },
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{ [s]: [1, 2, 3] },
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{ foo: 1 },
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{ [42]: "test" }
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)
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).toEqual({ foo: 1, bar: "baz", [s]: [1, 2, 3], 42: "test" });
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});
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});
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