```sealed class Error(val code: String) { object Type1 : Error("type1") data class Type2(val...

# getting-started

[allan.conda]

sealed class Error(val code: String) {
    object Type1 : Error("type1")
    data class Type2(val someParam: String) : Error("type2")
}

// somewhere else in code
if (error.code == Type2.code) { }

Is there a best practice for achieving a check like above with a data class sealed class?

[Roukanken]

you don't really need the code really
since you can do the check with is
eg, either error is Error.Type2 or do it with when

when(error) {
    is Error.Type1 -> {}
    is Error.Type2 -> {}
}

[Mykola Gurov]

if (error is Type2) ?

[Roukanken]

ye

[allan.conda]

Ah right. I think the example is incorrect. Suppose the code is a raw value from an API?

[allan.conda]

actually the error in error.code is of different type

[Mykola Gurov]

the code is val, so it won't be other than "type2" in your example

[allan.conda]

and I’m trying to map it

[Mykola Gurov]

if it were varying, than you'd have to check the code as you suggested

[allan.conda]

My code won’t compile since Type2 is a data class. I supposed I could do
if (error.code == Type2("").code)
but it looks hacky

[Roukanken]

what are you trying to figure out about the error?

[Mykola Gurov]

Do you mean the error isn't an instance of Error ?

[allan.conda]

yes, think like a generic SomeApiError

[Mykola Gurov]

OK, then you'd be better of by simply extracting the "type2" into a string constant and reusing both in the sealed class and in your some API error

[allan.conda]

I see, yeah, that’s probably it. like separate const vals for the codes itself