In which situation val/var is necessary in Kotlin constructor parameter?

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When you write val/var within the constructor, it declares a property inside the class. When you do not write it, it is simply a parameter passed to the primary constructor, where you can access the parameters within the init block or use it to initialize other properties. For example,

class User(val id: Long, email: String) {
    val hasEmail = email.isNotBlank()    //email can be accessed here
    init {
        //email can be accessed here
    }

    fun getEmail(){
        //email can't be accessed here
    }
}

Constructor parameter is never used as a property

This suggestion is saying that you do not use this property in place apart from the initialization. So, it suggests you to remove this property from the class.

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