PlayWithKotlin.kt

class Test {

    fun isAnagram(str1: CharArray, str2: CharArray): Boolean {
        val n1 = str1.size
        val n2 = str2.size

        if (n1 != n2) return false
        str1.sort()
        str2.sort()

        for (i in 0 until n1) if (str1[i] != str2[i]) return false
        return true
    }
}

object Fibonacci {
    tailrec fun recursiveTail(n: Long, a: Long, b: Long): Long
            = if (n < 1) a else recursiveTail(n - 1, b, a + b)

    fun iterative(n: Long): Long {
        if (n < 2) return n
        var minusOne: Long = 1
        var minusTwo: Long = 0
        var result = minusOne
        for (i in 2..n) {
            result = minusOne + minusTwo
            minusTwo = minusOne
            minusOne = result
        }
        return result
    }
}