how do I test if a value is an object? this is my ...

# javascript

[Bernhard]

how do I test if a value is an object? this is my JS code:

typeof x === 'object' && !Array.isArray(x) && x !== null;

[turansky]

jsTypeOf(x) == "object" && x !is Array && x != null

[Vampire]

Can it ever be null if the type is object?

[turansky]

Yes :)

[turansky]

null has type object

[Vampire]

Oh, JS is really a strange language :-D

[turansky]

All this Java* languages are very strange 🙂

[Bernhard]

@Vampire you've seen thing yet, I had to work around

class X {
    actions: {
        key: X.method
    }
    static method() {
        this.callInstanceMethod()
    }
    callInstanceMethod {
    }
    imClever ()  {
        this.actions.key.bind(this)()
    }
}

[Bernhard]

plus fighting against broken variance where

class Model {
    static update(model: Model): Model
}
class User extends Model {}
User.update(user) // takes and returns User

[Bernhard]

I'm slowly getting where I want to be, but there were so many uphill battles

[Bernhard]

it's all very under documented as well unfortunately

[turansky]

Silver bullet for variance fixes - extensions.
All List , Set , Sequence magic with variance - extensions.

[Bernhard]

https://github.com/JetBrains/kotlin-wrappers/pull/2329 hope I nailed the variance

[turansky]

Variance in EventTarget