如何使用地图在 kotlin 中使用大写（）列表中的一个 属性？

Question

我不明白为什么 return 数据不应用大写？

val userList: LiveData<List<UserData>> = Transformations.map(userRepository.getUsers()) { data ->
    data.forEach {
        it.name.toUpperCase()
        Log.i("uppercase", it.name.toUpperCase()) //uppercase working here
    }
    Log.i("data", data.toString())  //uppercase not there
    return@map data
}

Answer 1

val userList: LiveData<List<UserData>> = Transformations.map(userRepository.getUsers()) { data ->
    data.forEach {
        it.name = it.name.toUpperCase() //This is what you're missing, as explained by @forpas in the comment section.
        Log.i("uppercase", it.name.toUpperCase()) //uppercase working here
    }
    Log.i("data", data.toString())  //uppercase now there
    return@map data
}

功劳归功于@forpas，因为他首先回答，但不只是将其添加为答案。