Is there a way to use the default value on a non-optional parameter when null is passed?

Question

For example, if I have the following data class:

data class Data(
    val name: String = \"\",
    val number: Long = 0
)

And functions that ca

Answer 1

You can define a companion object for your data class and overload its invoke operator to use default values when null is passed:

data class Data private constructor(
    val name: String,
    val number: Long
) {
    companion object {
        operator fun invoke(
            name: String? = null,
            number: Long? = null
        ) = Data(
            name ?: "",
            number ?: 0
        )
    }
}