There are a few very specific differences. In a subclass, 'this' doesn't exist until you call "super" for example, and the constructor will throw an error of in

There are a few very specific differences. In a subclass, 'this' doesn't exist until you call "super" for example, and the constructor will throw an error of invoked without the "new" keyword. [O] These differences let you extend built-in things that simply can't be done with old prototype constructor syntax. [1] [O] I should probably be using a more recent reference like MDN, but the 2ality series always sticks out in my mind whenever "just syntax sugar" comes up: https://2ality.com/2015/02/es6-classes-final.html#safety-checks https://2ality.com/2015/02/es6-classes-final.html#safety-che... [1] https://2ality.com/2015/02/es6-classes-final.html#subclassing-built-in-constructors https://2ality.com/2015/02/es6-classes-final.html#subclassin...