Method call

src/main/java/org/dynjs/runtime/builtins/types/object/Keys.java:18–40

(ExecutionContext context, Object self, Object... args)

    }

    @Override
    public Object call(ExecutionContext context, Object self, Object... args) {
        // 15.2.3.14
        Object o = args[0];

        if (!(o instanceof JSObject)) {
            throw new ThrowException(context, context.createTypeError("must be an object"));
        }

        JSObject jsObj = (JSObject) o;

        JSObject array = BuiltinArray.newArray(context);

        int i = 0;
        NameEnumerator names = jsObj.getOwnEnumerablePropertyNames();
        while (names.hasNext()) {
            final String name = names.next();
            array.defineOwnProperty(context, "" + i,
                    PropertyDescriptor.newDataPropertyDescriptor(name, true, true, true), false);
            ++i;
        }
        return array;
    }
}