How to make function that validates first and last name input - Kotlin

Question

I need to make a function that verifies if the user writes his first and last name. It receives a string and returns a boolean. It returns true if the string has 2 names(first and last) and the first letter of each name has to be capitalized. I′ve been trying to make it but havent been able to do it, if anyone could help me i′d apreciate it. btw i′m doing this in kotlin.

edit: I forgot to mention that i can′t use .split()

Answer 1

You should split the string on spaces then check if the first letter is capitalized for each one:

fun checkName(name: String): Boolean {
    val names = name.split(' ')
    return names.size == 2 && names.all { it[0].isUpperCase() }
}

If you really can't use split or indexOf for some reason, then just use a loop:

fun checkName(name: String): Boolean {
    if (name.length == 0 || !name[0].isUpperCase()) {
        return false
    }
    var spaces = 0
    for (i in 0 until name.length) {
        if (name[i] == ' ') {
            spaces += 1
            if (spaces > 1 || !name[i + 1].isUpperCase()) {
                return false
            }
        }
    }
    return true
}