编辑“︁Kotlin”︁（章节）

===高阶函数与lambda===

Kotlin 亦支持高阶函数和lambdas功能。lambda是一种匿名函数，允许开发者直接将表达式定义为函数，这类似于Python。<ref>{{cite web|title=Higher-Order Functions and Lambdas|url=https://kotlinlang.org/docs/reference/lambdas.html|website=Kotlin|publisher=Jetbrains|accessdate=19 January 2018|archive-date=2021-01-22|archive-url=https://web.archive.org/web/20210122222128/https://kotlinlang.org/docs/reference/lambdas.html|dead-url=no}}</ref>

<syntaxhighlight lang=kotlin>
// the following function takes a lambda, f, and executes f passing it the string, "lambda"
// note that (s: String) -> Unit indicates a lambda with a String parameter and Unit return type
fun executeLambda(f: (s: String) -> Unit) {
    f("lambda")
}
</syntaxhighlight>

Lambdas 可用大括弧{{mono| {  } }}來定义。如果lambda 夾帶參數，他們可定义在大括弧内，並以{{mono|->}}运算符區隔。
<syntaxhighlight lang="kotlin">
// the following statement defines a lambda that takes a single parameter and passes it to the println function
val l = { c : Any? -> println(c) }
// lambdas with no parameters may simply be defined using { }
val l2 = { print("no parameters") }
</syntaxhighlight>