I’m learning Ktor and Kotlin. I’m trying to create a validation function for my Ktor 2 server app. I...

# ktor

[dany giguere]

I’m learning Ktor and Kotlin. I’m trying to create a validation function for my Ktor 2 server app.
I came up with :

fun validate(title: String): Json {
        val errors: Json
        val titleArray: Array<String?>
        if(title.length < 20) {
            titleArray.add("The title must contain at least 20 characters")
        }
        if(title.length > 100) {
            titleArray.add("The title must contain no more than 100 characters")
        }
        if(titleArray.length > 0) {
            errors.title = titleArray
        }
        return Json {
            "errors": errors
        }
    }

as it is, I get this error : Variable 'titleArray' must be initialized

[Sam]

The error is telling you what you need to do. You have to initialise a variable (by assigning a value to it with =) before you can access it. In this case I think you'll find it easier to use a list than an array, so try:

val titleArray = mutableListOf<String>()

[dany giguere]

thanks @Sam