FormField.kt

// ...

// Validate extention function for collection of FormFields. It will execute validate method of each field and return boolean result.
suspend fun Collection<FormField<*>>.validate(validateAll: Boolean = false) = coroutineScope {
    if (validateAll) {
        map { formField -> async { formField.validate(focusIfError = false) } }.awaitAll().all { result -> result }
    } else {
        all { formField -> formField.validate() }
    }
}

// ...