197日目

日記

寒いね

今日書いたコード

fun main() {
    // val triple: (Int) -> Int = { a: Int -> a * 3 }
    val triple: (Int) -> Int = {
        print(it)
        it * 3
    }
    println(triple(5))
    // println(hoge(5))
}

fun hoge(it: Int): Int {
    print(it)
    it * 3 // A 'return' expression required in a function with a block body ('{...}')
}

感想

Kotlinだとラムダ式というのが正式っぽい．

ラムダ式だけ暗黙的に最後の式が返り値になってそう．Kotlinはラムダ式と関数が別物なのか？*1

The last expression in the lambda is the return value. https://developer.android.com/codelabs/basic-android-kotlin-training-collections?continue=https%3A%2F%2Fdeveloper.android.com%2Fcourses%2Fpathways%2Fandroid-basics-kotlin-unit-3-pathway-1%23codelab-https%3A%2F%2Fdeveloper.android.com%2Fcodelabs%2Fbasic-android-kotlin-training-collections#3

*1:文脈: Swiftの場合はGlobal and nested functions, as introduced in Functions, are actually special cases of closures.