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LibJS: Implement Object.is()

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Basically === with two particularities: comparing NaN to itself is
considered equal and comparing +0 and -0 is not.
This commit is contained in:
Linus Groh 2020-04-26 00:27:54 +01:00 • committed by Andreas Kling
parent f191b84b50
commit 38ba13e912
4 changed files with 73 additions and 0 deletions
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17
Libraries/LibJS/Runtime/ObjectConstructor.cpp
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@ -41,6 +41,7 @@ ObjectConstructor::ObjectConstructor()
put("prototype", interpreter().global_object().object_prototype());
put_native_function("defineProperty", define_property, 3);
put_native_function("is", is, 2);
put_native_function("getOwnPropertyDescriptor", get_own_property_descriptor, 2);
put_native_function("getOwnPropertyNames", get_own_property_names, 1);
put_native_function("getPrototypeOf", get_prototype_of, 1);
@ -146,4 +147,20 @@ Value ObjectConstructor::define_property(Interpreter& interpreter)
return &object;
}
Value ObjectConstructor::is(Interpreter& interpreter)
{
auto value1 = interpreter.argument(0);
auto value2 = interpreter.argument(1);
if (value1.is_nan() && value2.is_nan())
return Value(true);
if (value1.is_number() && value1.as_double() == 0 && value2.is_number() && value2.as_double() == 0) {
if (value1.is_positive_zero() && value2.is_positive_zero())
return Value(true);
if (value1.is_negative_zero() && value2.is_negative_zero())
return Value(true);
return Value(false);
}
return typed_eq(interpreter, value1, value2);
}
}