strict mode <img width="694" alt="Снимок экрана 2020-07-13 в 15 57 57" src="https://user-images.githubusercontent.com/23016311/87307128-bcc76c00-c521-11ea-8b8e-b33e104c6cd0.png"> <img width="961" alt="Снимок экрана 2020-07-13 в 15 59 11" src="https://user-images.githubusercontent.com/23016311/87307184-d2d52c80-c521-11ea-835b-4552228c9944.png">
strict mode
