hey guys So i hav a base class called Wearable and...

# getting-started

[otakusenpai]

hey guys
So i hav a base class called Wearable and this class has a member named "name"
And i hav another class name ClothTunic and this class inherits the class Wearable plus has a member named "armor"
And say for examples sake, a class named PowerRing which inherits the Wearable and has a member named "strenght"
So all this wearables are managed by a WearableManager which has a function called getTotalArmor() : Int which returns the total armor from all these wearables tht a entity has.

So my question was this: How do i know which Wearable has a "armor" variable or a "strength" variable? How do i do it in Kotlin?

[Shawn]

how do I do it in Kotlin

the same way you’d do it in any language - group classes together based on the shape you expect them to have, i.e. the methods they expose

[Shawn]

Wearable sounds like a very base interface that doesn’t cover your armor use case if it doesn’t apply to all of your wearables

[Nikky]

in java you would use instanceof
in kotlin we can use the magic of is and when

when(wearable) {
    is Stength -> { }
    is Named -> { }
}

[Nikky]

Strength and named could be interfaces with just hose variables

[Shawn]

you could create a different interface for armor and match upon it to access their respective getTotalArmor() method

[Nikky]

although assuming osmething has both maybe you should just use multiple if

[Shawn]

or you could have every wearable implement an armor val and have items that don’t provide armor just return 0

[Nikky]

technically oyu could (but shouldn't) use reflection

[Shawn]

you don’t need reflection to model this.

[otakusenpai]

yeah but Wearable objects might hav both armor or strenght
How do i know which wearable object has which one?

[Nikky]

assuming its with classes oyu do not control

[otakusenpai]

yes i control them

[Nikky]

if(wearable is Named)


interface Named {
    var name: String
}

[Nikky]

have some specific wearable implement Named and override the name

[otakusenpai]

ok

[otakusenpai]

but what if the Wearable hav both "armor" and "strenght" ?

[Nikky]

then later you can filter a list of wearables with wearabbles.filter { it is Named }

[Nikky]

what then ? things can implement more than one interface.. whats the problem ?
you need to check them seperately

[otakusenpai]

ok

[otakusenpai]

thnx a lot