https://medium.com/@amv0107/%D1%80%D0%B0%D0%B7%D0%BD%D0%B8%D1%86%D0%B0-%D0%BC%D0%B5%D0%B6%D0%B4%D1%83-var-val-%D0%B8-const-val-%D0%B2-kotlin-b5f005f2d6e6
