August 2020
Intermediate to advanced
483 pages
11h 24m
Chinese
Content preview from Head First Kotlin程序设计
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334 第
11
章
试运行
创建
Lambdas
项目
现在你已经了解如何创建
lambda
，让我们添加一些
lambda
到新的应用程序。
创建一个面向
JVM
的
Kotlin
项目，并命名为“
Lambdas
”。然后创建一个
新的
Kot
lin
文件Lambdas.kt。选中src文件夹，点击
File
菜单，依次选择
New
→
Kotlin
File/Class
。出现提示时，填写文件名“
Lambdas
”，然后在
Kind
选项中选择
File
类型。
接下来，请更新Lambdas.kt文件中的代码版本，使其与如下代码一致：
fun main(args: Array<String>) {
var addFive = { x: Int -> x + 5 }
println("Pass 6 to addFive: ${addFive(6)}")
val addInts = { x: Int, y: Int -> x + y }
val result = addInts.invoke(6, 7)
println("Pass 6, 7 to addInts: $result")
val intLambda: (Int, Int) -> Int = { x, y -> x * y }
println("Pass 10, 11 to intLambda: ${intLambda(10, 11)}")
val addSeven: (Int) -> Int = { it + 7 }
println("Pass 12 to addSeven: ${addSeven(12)}") ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.