Lambda

http://blog.oneapm.com/apm-tech/226.html

android

https://maxwell-nc.github.io/android/retrolambda.html

https://cloud.tencent.com/developer/article/1526621

https://juejin.im/post/6844903668592934925

kotlin lambda

https://juejin.im/post/6844903604613021703

Video

Java lambda

函数式编程

https://www.bilibili.com/video/av54941486/

http://www.chilangedu.com/sectionq/2132352424

map

<R> Stream<R> map(Function<? super T, ? extends R> mapper);

public interface Function<T, R> {
	    R apply(T t); //将T类型转为R
}