It's sort of wrong, but not really if we are using the commonly used definition of inheritance where we think of the strict hierarchical inheritance provided by classes. And you mention prototype delegation which is only one type of inheritance provided by javascript and is also hierarchical. There are two other types of inheritance you can use with javascript: functional inheritance, and concatenative inheritance. Concatenative inheritance is so different from class inheritance that most people don't even call it inheritance. They call it object composition. Which has been preferred over class inheritance as far back as the GoF "Favor object composition over class inheritance." More here: https://medium.com/javascript-scene/master-the-javascript-in...