小编Bru*_*uno的帖子

我正在使用带有play2的java8,具有此配置.

name := """shipping"""

version := "1.0-SNAPSHOT"

lazy val root = (project in file(".")).enablePlugins(PlayJava)

scalaVersion := "2.11.1"

libraryDependencies ++= Seq(
  javaJdbc,
  javaEbean,
  cache,
  javaWs,
  "org.apache.axis" % "axis" % "1.4",
  "net.sf.barcode4j" % "barcode4j" % "2.1",
  "xml-apis" % "xml-apis" % "1.4.01",
  "javax.xml" % "jaxrpc-api" % "1.1",
  "org.webjars" % "flot" % "0.8.0",
  "org.webjars" % "bootstrap" % "2.3.1",
  "commons-discovery" % "commons-discovery" % "0.4",
  "postgresql" % "postgresql" % "9.1-901.jdbc4",
  "wsdl4j" % "wsdl4j" % "1.6.2",
  "org.apache.xmlgraphics" % "fop" % "1.0"
)

javacOptions ++= Seq("-source", "1.8", "-target", …

大家好,我正在尝试理解scala中的符号"_",它看起来像一个通配符,但我不明白为什么在给定的场景中.

   var l = List("a","b" ,"c")
   // Works "s" works as a variable.
   l.foreach( s =>
     if(s=="a"){
       print(s)
     }
   )

   // Works _ takes the place of "s"
   l.foreach(
     print(_)
   )

  //So the doubt is whether "_" is a wildcard that does not work well.

  l.foreach(
    if(_=="a"){
      print(_)
    }
  )

"_"应该像变量一样s,但为什么不呢？

Python有Fabric库来执行这样的操作,Clojure有这样的选择吗？

我如何计算移动和网络访问权限从地图列表中丢弃零值？输出应该是这样的"统计移动= 1 web = 2",但所有其他语言都可以通过简单的i ++解决,但是如何在clojure中.谢谢.

        def data [{:name "app1" :type "mobile" }
        {:name "site1" :type "web" }
        {:name "site1" :type "web" }
        {:name "boot" :type nil }]