Exercism - Twofer (with.Kotlin)

[문제]

Two-fer or 2-fer is short for two for one. One for you and one for me.

Given a name, return a string with the message:

One for X, one for me.

Where X is the given name.

However, if the name is missing, return the string:

One for you, one for me.

Here are some examples:

NameString to return

Alice	One for Alice, one for me.
Bob	One for Bob, one for me.
One for you, one for me.
Zaphod	One for Zaphod, one for me.

 

---

 

[Solution 1]

object Twofer {
    fun twofer(name:String? = null) : String{

        if(name == null){
            return "One for you, one for me."
        }

        return "One for $name, one for me."
    }
}

맨처음 풀이는 그냥 간단하게 null 을 이용해서 구분을 하였습니다.

 

[Solution 2]

object Twofer {
    fun twofer(name:String = "you") : String{
        return "One for $name, one for me."
    }
}

그 다음은 "you"를 기본값으로 변경하여 리턴하도록 변경하였습니다.

 

[Solution 3]

object Twofer {
    fun twofer(name:String = "you") = "One for $name, one for me."
}

마지막은 fun을 줄여서 단순화 하였습니다. 아래 링크 참고

https://kotlinlang.org/docs/reference/functions.html#single-expression-functions

Functions: infix, vararg, tailrec - Kotlin Programming Language