问题

I can help with that. Here's the translation of the code portion:

我有三个文本字段，用于输入姓名、年龄和性别，并使用一个 uiState 数据类来保存输入的状态：

data class UiState(
val nameInput: String = "",
val ageInput: String = "",
val genderInput: String = "",
)

为了更新状态，我使用以下函数来处理文本字段的 onValueChanged 函数（每个属性都有一个函数：姓名、年龄和性别）：

```kotlin
fun updateInput(input: String, attribute: String) {
    _uiState.update {
        when (attribute) {
            "nameInput" -> it.copy(nameInput = input)
            "ageInput" -> it.copy(ageInput = input)
            "genderInput" -> it.copy(genderInput = input)
            else -> it
        }
    }
}

现在，您可以使用一个函数来更新这三个文本字段中的任何一个。感谢您的提问。

Please note that I've combined the three functions into one by introducing an "attribute" parameter to specify which input field you want to update.

<details>
<summary>英文:</summary>

I have 3 textFields for name, age and gender in compose and use a uiState data class to hold the states of the inputs:

data class UiState( 

     val nameInput: String = "",
     val ageInput: String = "",
     val genderInput: String = "",
)

To update the states I use the following functions for the onValueChanged function (one function for each attribute: name, age and gender) of the textfields:

fun updateNameInput(input: String) {
        _uiState.update { it.copy(nameInput = input) }
    }

    fun updateAgeInput(input: String) {
        _uiState.update { it.copy(ageInput = input) }
    }

    fun updateGenderInput(input: String) {
        _uiState.update { it.copy(genderInput = input) }
    }

Now my question is, how can I boil those 3 functions into one and pass in the argument (eighter nameInput, ageInput or genderInput) in the function definition and update only that argument.

I want to be able to use only one function to be used to update eighter of those 3 textfields.

Thanks in advance.

</details>


# 答案1
**得分**: 1

以下是已翻译的代码部分：

```kotlin
要将它放入一个函数中，我想你可以使函数参数变为可选，并为那些非空的参数创建新的副本。然后，您可以使用空默认参数使它们变为可选。

fun updateNonNullInput(name: String? = null, age: String? = null, gender: String? = null) { 
    _uiState.update {
        var value = it
        if (name != null) value = value.copy(nameInput = name)
        if (age != null) value = value.copy(ageInput = age)
        if (gender != null) value = value.copy(genderInput = gender)
        value
    }
}

（注意：我已经去掉了 "To put it in one function, I suppose you could" 这一句，因为它不是代码的一部分。）

 fun updateNonNullInput(name: String? = null, age: String? = null, gender: String? = null) { 
     _uiState.update {
         var value = it
         if (name != null) value = value.copy(nameInput = name)
         if (age != null) value = value.copy(ageInput = age)
         if (gender != null) value = value.copy(genderInput = gender)
         value
     }
 }