Check if multiple strings are empty or not without using if and when

You can make one generic function to check all string are valid or not.

You can take n number of strings as vararg and can check each of them by making one util or extension function.

Here is Util class

object StringUtils {

fun isAllValid(vararg args: String?) : Boolean {

    //checking all strings passed and if a single string is not valid returning false.
    args.forEach {
        if(isNotValid(it))
            return false
    }
    return true
}

fun isValid(string: String?): Boolean {
    return string != null && string.isNotEmpty() && string.isNotBlank()
}

fun isNotValid(string: String?) : Boolean {
    return isValid(string).not()
}

}

and you can use like this

fun changeUserAccount(
        userName: String,
        password: String,
        confirmPassword: String,
        realName: String,
        accountEmail: String,
        applicationContext: Context
    ) {

        //You can pass n number of strings.
        val isAllStringsValid = StringUtils.isAllValid(userName,password,confirmPassword,realName,accountEmail)

       //this returns true
       StringUtils.isAllValid("hi","how","are","you","?")


       //this returns false
       StringUtils.isAllValid("","how","are","you","?")


       //this returns false
       StringUtils.isAllValid(null,"how","are","you","?")


       //this returns false
       StringUtils.isAllValid("","how","are","you","?")
    }