CODEWITHSUNDEEP
androidkotlinlambdacollectionsfiltering
ayhanunal
ayhanunal

Reputation: 83

nested list filtering without changing object type in kotlin

I want to filter nested lists with kotlin without changing the object type.

data class ExamResponse(
    val list: List<ExamObj>
)

data class ExamObj(
    val objList: List<ExamObj2>
)

data class ExamObj2(
    val name: String,
    val age: Int
)

For example, I want to get the list 'ExamObj' with age value 27 for the above model. The method to return the list is as follows. fun progress(respList: List<ExamObj>): List<ExamObj>{}

this method takes a list of 'ExamObj' and filters the 'objList' in 'ExamObj' and returns the 'ExamObj' list again

val result = respList.map {
        it.objList.filter {
            it.age == 27
        }
    }

Using this I achieved the desired result but the type issue appeared.

enter image description here

Upvotes: 0

Views: 820

Answers (1)

Arthur Frade
Arthur Frade

Reputation: 71

I think you forgot to wrap filtered ExamObj2 list in a ExamObj class...

val result = respList.map { examObj ->
    ExamObj(examObj.objList.filter { it.age == 27 })
}

Upvotes: 2

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