If you have some validation method like `isValidUs...

# announcements

[ahegazy]

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?

[louiscad]

@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()
}

[louiscad]

suspend modifier is optional. I added because I assume you're checking into some database that no one has taken the username yet, and same for email

[Albert]

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

[Denis A]

I Use this struture

[Denis A]

object Regulars{
val notEmpty = Regex(“^(?!\\s*$).+“)
}
val tt = Regulars.notEmpty.matches(“some text”)

[ahegazy]

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

[louiscad]

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

[Paul Woitaschek]

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