CODEWITHSUNDEEP
kotlin
HelloCW
HelloCW

Reputation: 2365

Can I add a field of MVoice in List to mutableSetOf() with Kotlin?

I can use Code A add all id of MVoice in a List to val selectedIDs: MutableSet<Int>.

I think I can simplify it, and add all id of List at one time, but Code B doesn't work, how can I fix it?

Code A

 val selectedIDs: MutableSet<Int> = mutableSetOf()
   val listVoiceBySort: LiveData<List<MVoice>> =_listVoiceBySort
        
   listVoiceBySort.value?.forEach(){
      selectedIDs.add(it.id)
   }

Code B

   val selectedIDs: MutableSet<Int> = mutableSetOf()
   val listVoiceBySort: LiveData<List<MVoice>> =_listVoiceBySort

   listVoiceBySort.value?.let{
      selectedIDs.addAll(it.id) 
   }

Upvotes: 0

Views: 62

Answers (1)

Sơn Phan
Sơn Phan

Reputation: 1170

This should work:

val selectedIDs: MutableSet<Int> = mutableSetOf()
val listVoiceBySort: LiveData<List<MVoice>> =_listVoiceBySort

listVoiceBySort.value?.map { it.id }?.let {
    selectedIDs.addAll(it) 
}

Upvotes: 1

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