Kotlin匿名函数用例? [英] Kotlin anonymous function use case?

问题描述

根据我的理解，Kotlin中的匿名函数允许您指定返回类型.除此之外，anonymous内部的return语句将仅退出功能块，而在lambda中，它将退出封闭的功能.

Based on my understanding, anonymous function in Kotlin allow you to specify return type. In addition to that, return statement inside anonymous will exit only the function block, while in lambda it will exit the enclosing function.

还是，我无法想象lambda语法无法提供的Kotlin匿名函数在现实世界中的用例是什么?

Still, I can't imagine what would be the real world use case of anonymous function in Kotlin that lambda syntax cannot provide?

科特林高阶函数和Lambda

推荐答案

用例是有时我们可能希望对返回类型进行明确说明.在这种情况下，我们可以使用所谓的匿名函数.示例:

The use case is that sometimes we may wish to be explicit about the return type. In those cases, we can use so called an anonymous function. Example:

fun(a: String, b: String): String = a + b

或者更好的返回控制，例如:

Or better return control like:

fun(): Int {
    try {
        // some code
        return result
    } catch (e: SomeException) {
        // handler
        return badResult
        }
}

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