If you have some validation method like

isValidUsername

or

isValidEmail

, do you feel it’s okay to write this as an extension method to String?

@ahegazy Here's a way to do it without pollution your auto-completion:

object DataValidation {
    suspend fun String.isValidUsername() = ...
    suspend fun String.isValidEmail() = ...
}

with(DataValidation) {
    someInputUserNameString.isValidUsername()
}

I think adding database behavior in this might become unpredictable. With an extension method I assume that it does not need more information only then the class it is extending

I Use this struture

@louiscad Interesting way to do it! didn’t know that we can use

with

with extension methods 🙂

About my

suspend fun

example, if you ever do some db check or alike (that is, not listening to @Albert wise words) that can suspend, be sure to not let this be your only consistency check, or you're opening your system to race conditions otherwise

If I can't scope it to the class using it, I use a top level funcition that just it as an argument.