Exercism - Scrabble Score (With.Kotlin)

[문제]

Given a word, compute the scrabble score for that word.

Letter Values

You'll need these:

Letter : Value

A, E, I, O, U, L, N, R, S, T : 1

D, G : 2

B, C, M, P : 3

F, H, V, W, Y : 4

K : 5

J, X : 8

Q, Z : 10

Examples

"cabbage" should be scored as worth 14 points:

• 3 points for C
• 1 point for A, twice
• 3 points for B, twice
• 2 points for G
• 1 point for E

And to total:

• 3 + 2*1 + 2*3 + 2 + 1
• = 3 + 2 + 6 + 3
• = 5 + 9
• = 14

Extensions

• You can play a double or a triple letter.
• You can play a double or a triple word.

 

 

[Solution1]

object ScrabbleScore {
    fun scoreWord(input: String): Int {
        var point = 0

        val listOfPointOne = listOf('A', 'E', 'I', 'O', 'U', 'L', 'N', 'R', 'S', 'T')
        val listOfPointTwo = listOf('D', 'G')
        val listOfPointThree = listOf('B', 'C', 'M', 'P')
        val listOfPointFour = listOf('F', 'H', 'V', 'W', 'Y')
        val listOfPointFive = listOf('K')
        val listOfPointEight = listOf('J', 'X')
        val listOfPointTen = listOf('Q', 'Z')

        input.toCharArray().map {
            when (it.toUpperCase()) {
                in listOfPointOne -> point += 1
                in listOfPointTwo -> point += 2
                in listOfPointThree -> point += 3
                in listOfPointFour -> point += 4
                in listOfPointFive -> point += 5
                in listOfPointEight -> point += 8
                in listOfPointTen -> point += 10
            }
        }

        return point
    }
}

해당 리스트를 포인트별로 구분하여 포인트의 합을 구함

[Solution2]

object ScrabbleScore {
    fun scoreWord(input: String): Int = input.toCharArray().map { checkCharPoint(it) }.sum()

    private fun checkCharPoint(c : Char): Int{
        return when (c.toUpperCase()) {
            'A', 'E', 'I', 'O', 'U', 'L', 'N', 'R', 'S', 'T' -> 1
            'D', 'G' -> 2
            'B', 'C', 'M', 'P' -> 3
            'F', 'H', 'V', 'W', 'Y' -> 4
            'K' -> 5
            'J', 'X' -> 8
            'Q', 'Z' -> 10
            else -> throw Exception("Unknow Char : $c")
        }
    }
}

point 라는 변수를 사용 하지 않고 sum()을 사용해서 합을 도출하도록 변경

 

[Solution3]

object ScrabbleScore {
    fun scoreWord(input: String): Int = input.sumBy { charPoint(it) }

    private fun charPoint(c : Char): Int{
        return when (c.toUpperCase()) {
            'A', 'E', 'I', 'O', 'U', 'L', 'N', 'R', 'S', 'T' -> 1
            'D', 'G' -> 2
            'B', 'C', 'M', 'P' -> 3
            'F', 'H', 'V', 'W', 'Y' -> 4
            'K' -> 5
            'J', 'X' -> 8
            'Q', 'Z' -> 10
            else -> throw Exception("Unknow Char : $c")
        }
    }
}

코드를 최적화 , map 과 sum 을 합친 sumBy 를 사용 하여 처리 하도록 수정