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LibJS: Accept symbol property in the in operator

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This is used by discord.com and allowed by the specification:
https://tc39.es/ecma262/#sec-relational-operators-runtime-semantics-evaluation
This commit is contained in:
Idan Horowitz 2021-04-17 01:46:48 +03:00 • committed by Linus Groh
parent 7744048d0f
commit 586f10b6e1
2 changed files with 5 additions and 3 deletions
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4
Userland/Libraries/LibJS/Runtime/Value.cpp
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@ -1020,10 +1020,10 @@ Value in(GlobalObject& global_object, Value lhs, Value rhs)
global_object.vm().throw_exception<TypeError>(global_object, ErrorType::InOperatorWithObject);
return {};
}
auto lhs_string = lhs.to_string(global_object);
auto lhs_string_or_symbol = StringOrSymbol::from_value(global_object, lhs);
if (global_object.vm().exception())
return {};
return Value(rhs.as_object().has_property(lhs_string));
return Value(rhs.as_object().has_property(lhs_string_or_symbol));
}
Value instance_of(GlobalObject& global_object, Value lhs, Value rhs)

4
Userland/Libraries/LibJS/Tests/operators/in-operator-basic.js
View file

@ -1,10 +1,12 @@
test("in operator with objects", () => {
const o = { foo: "bar", bar: undefined };
const sym = Symbol();
const o = { foo: "bar", bar: undefined, [sym]: "qux" };
expect("" in o).toBeFalse();
expect("foo" in o).toBeTrue();
expect("bar" in o).toBeTrue();
expect("baz" in o).toBeFalse();
expect("toString" in o).toBeTrue();
expect(sym in o).toBeTrue();
});
test("in operator with arrays", () => {