You can use class as a type which is the way you’re using it. So, whether Hero is an interface or class it doesn’t matter because you’re using it as a type.
class Hero { id: number; name: string }
or
interface Hero { id: number; name: string }
The following doesn’t concern whether Hero is a class or interface
let hero: Hero = { id: 1, name: 'me' }
Where interface
and class
differentiate is interface
is only for you, it doesn’t get transpiled into javascript. A class
does and you cannot new
an interface
.
Constructor or no Constructor, if you new
it then it is an instanceof
. Try it again with this
let hero = new Hero();
Your instanceof
log will be true
because you did create an instance of Hero with the key word new
.