Hello ! If someone could help me ... I'm lost :dis...

# announcements

[WildRhum]

Hello ! If someone could help me ... I'm lost 😞
I need to sort a list of object by multiple values.
It should be first sorted based on an Int and after if a boolean is true.
It's working fine when I do one (Int or boolean) with sortedWith and compareBy, but don't know how to do both.
Any suggestion ?

[diesieben07]

list.sortedWith(compareBy({ it.firstProperty }, { it.secondProperty }))

[nikolay]

compareBy {
        //...
      }.thenBy() {
        //...
      }

[diesieben07]

Or that.

[WildRhum]

Ty, I already tried Take version, but I get a weird error ..
I tried your solution Nikolay but I can't use it with this structure it seems

[diesieben07]

Can you show your code and the error you get please?

[WildRhum]

Ye,s it's comming

[WildRhum]

Some contexte :
I try to create a bot for a card game like hearthstone which will be like a tutorial.

fun getMonsterToKill(ennemyCard: Card, myCards: List<Card>): Card{
return myCards.sortedWith(compareByDescending({ it.attack - ennemyCard.defense }, { it.abilities.contains("Divine") }))[0]
}

[WildRhum]

abilities is a list of string with all the abilities of the card

[diesieben07]

There is no compareByDecending with that signature.

[diesieben07]

If you need such a comparator, you need to do compareBy(...).reversed().

[diesieben07]

However in this case you do not need to sort the whole list, just do something like this:

val comparator = compareBy<Card>({ it.attack - ennemyCard.defense }, { it.abilities.contains("Divine") })
return myCards.maxWith(comparator) ?: TODO("default value if list is empty")

[WildRhum]

Oh .. I found code with compareBy, so I though compareByDecending would work 😞

[WildRhum]

Thanks a lot ! It seems to compile 🙂
What will be the outcome of maxWith on the boolean value ?
Sorted by true ?

[diesieben07]

false will come before true

[WildRhum]

Ok, so I just need to negate : { it.abilities.contains("Divine") }

[diesieben07]

I can only recommend to use in operator here

[WildRhum]

Oh good idea and thank you very much, it's working just as I wanted !
I'll try to help other also, guess I won't help you much 🙃