what s the default suggested safest recommended way to initi kotlinlang #getting-started

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Title

oday

04/17/2019, 8:07 AM

what’s the default/suggested/safest/recommended way to initialize stuff like this ? http://snpy.in/kISHVt

Igor Khvostenkov

04/17/2019, 8:28 AM

You can use default values for

String

and

Int

lateinit

for non primitives.

lateinit var smth: String
var smth: String = ""
var smth: Int = 0

oday

04/17/2019, 8:52 AM

this is the way to go isn’t it?

only in Kotlin do I find myself resorting to this ? = null initialization

because it’s allowing me to set anything as a defualt value null

so I think it’s the safest since the option is now open to me, I start thinking that yea an Int could be sent to me as null

Igor Khvostenkov

04/17/2019, 8:56 AM

Then you need to decide if you want to be defensive or offensive when receive null

Daniel Garibaldi

04/17/2019, 10:56 AM

all values are optional? is this a data class?

👍 1

Are you planing to use jackson with it? because you can set default values in jackson and there's no need to set defaults in data class

Nezteb

04/23/2019, 8:01 PM

If you have an

init { }

block in the class, you can just make them all

val thing: String

and it won’t complain because they will always be initialized

Otherwise: The

var thing: String? = null

is basically the equivalent in Java because anything can be null. You’re just forced to acknowledge it in Kotlin.

You could use a

data class

. That screenshot only shows a bunch of properties, which data classes are perfect for wrapping. Assuming this isn’t a huge class with lots of methods.

oday

04/27/2019, 2:30 PM

why would I use a data class?

sorry for the extremely late answer, but a data class will offer you a hash and equals methods no?

what’s the value here, but good point for init!

during testing, I need these values to be initialized all auotmatically so that I can instantiate objects of this class with the fields I want, i dont wanna run around and have them all filled before i get the chance to use the class

Nezteb

04/30/2019, 7:33 PM

Ah, the reason I suggested a data class is in that screenshot I didn’t see any functions, just data. So I was thinking you could have a

data class

for all of that.

data class ClassConfig(...)
class MyClass {
    val config = ClassConfig(
        ....
    )
    // Functions here...
}

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