引言

传统解决思路

package com.zxl.scalaobject PartiakFunDemo1 {def main(args: Array[String]): Unit = {val list: List[Any] = List(1, 2, 3, 4, "abc")val list1: List[Any] = list.filter(_.isInstanceOf[Int])val list2: List[Int] = list1.map(_.asInstanceOf[Int] + 1)list1.foreach(println)println("*"*20)list2.foreach(println)}
}

模式匹配解决

package com.zxl.scalaobject PartiakFunDemo1 {def main(args: Array[String]): Unit = {//传统解决思路//test1//  模式匹配解决思路var list: List[Any] = List(1, 2, 3, 4, "abc")list = list.map(addOne)list.foreach(println)}def addOne(a: Any) = {a match {case x: Int => x + 1case _ =>}}private def test1 = {var list: List[Any] = List(1, 2, 3, 4, "abc")list = list.filter(_.isInstanceOf[Int])list.foreach(println)list = list.map(_.asInstanceOf[Int] + 1)println("*" * 20)list.foreach(println)}
}

偏函数解决思路

package com.zxl.scalaobject PartiakFunDemo1 {def main(args: Array[String]): Unit = {//传统解决思路//test1//  模式匹配解决思路var list: List[Any] = List(1, 2, 3, 4, "abc")//list = list.map(addOne)//list.foreach(println)//  偏函数解决思路val partialFunc: PartialFunction[Any, Int] = new PartialFunction[Any, Int] {override def isDefinedAt(x: Any): Boolean = {println("x=" + x)println("++++")x.isInstanceOf[Int]}override def apply(v1: Any): Int = {println("v1="+v1)println("----")v1.asInstanceOf[Int]+1}}val list1: List[Int] = list.collect(partialFunc)println(list1)}def addOne(a: Any) = {a match {case x: Int => x + 1case _ =>}}private def test1 = {var list: List[Any] = List(1, 2, 3, 4, "abc")list = list.filter(_.isInstanceOf[Int])list.foreach(println)list = list.map(_.asInstanceOf[Int] + 1)println("*" * 20)list.foreach(println)}
}

日志输出：

D:\Develop\Java\jdk1.8.0_202\bin\java.exe "-javaagent:D:\Programs\IntelliJ IDEA 2021.1.2\lib\idea_rt.jar=53987:D:\Programs\IntelliJ IDEA 2021.1.2\bin" -Dfile.encoding=UTF-8 -classpath 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com.zxl.scala.PartiakFunDemo1
x=1
++++
v1=1
----
x=2
++++
v1=2
----
x=3
++++
v1=3
----
x=4
++++
v1=4
----
x=abc
++++
List(2, 3, 4, 5)Process finished with exit code 0

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Scala偏函数使用示例

引言

传统解决思路

模式匹配解决

偏函数解决思路

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