[Как бы истинный и ложный](https://github.com/azat-io/you-dont-know-js-ru/blob/master/up%20%26%20going/ch2.md#%D0%BA%D0%B0%D0%BA-%D0%B1%D1%8B-%D0%B8%D1%81%D1%82%D0%B8%D0%BD%D0%BD%D1%8B%D0%B9-%D0%B8-%D0%BB%D0%BE%D0%B6%D0%BD%D1%8B%D0%B9) 
