Kotlin Koans 09 Extension functions

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目次

Extension functions (Playground)

Description

Read about extension functions. Then implement extension functions Int.r() and Pair.r() and make them convert Int and Pair to RationalNumber.

拡張関数 を読んでください。拡張関数Int.r()とPair.r()を実装し、IntとPairをRationalNumberに変換してください。

Code 

fun Int.r(): RationalNumber = RationalNumber(this, 1)
fun Pair<Int, Int>.r(): RationalNumber = RationalNumber(first, second)

data class RationalNumber(val numerator: Int, val denominator: Int)

Memo

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