How can I check if an object is an instance of a class without including inherited classes?

Asked Sep 28 '21 at 14:40

Active Sep 28 '21 at 14:54

Viewed 30 times

I've looked over Google with multiple searches and searched through Stack Overflow but I can't find and answer to this simple problem. Here's some example code to show what I mean. I want to detect the class A without also detecting all class B objects

class A {}
class B extends A {}

let x = new A();
let y = new B();

console.log(x instanceof A && y instanceof A); // Returns true because Y inherits
console.log(y isMemberOf A)); // Should return false.

Typeof just says "object" which isn't helpful. What can I use to say "isMemberOf" in real JavaScript?

edited Sep 28 '21 at 14:54

asked Sep 28 '21 at 14:40

DexieTheSheep

1

you want `y isMemberOf A` to return false right? – thchp Sep 28 '21 at 14:49
2

Why `y` isMemberOf `B` should be `false`? – BadPiggie Sep 28 '21 at 14:49
Yes. @BadPiggie Because I'm trying to find out if the object is a member of an exact class, not including any classes it inherits – DexieTheSheep Sep 28 '21 at 14:53
@DexieTheSheep y is an instance of B. It can't be a member of B. – thchp Sep 28 '21 at 14:53
Wait, I screwed up on the second console log message. Just edited the post to show what I meant. – DexieTheSheep Sep 28 '21 at 14:54

How can I check if an object is an instance of a class without including inherited classes?

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