Functions that return multiple values Functions that can accept variable arguments Functions that use a value from outside of the function's body None of theseAnswer: C) Functions that use a value from outside of the function's bodyExplanation:...
你开始使用Akka时可以不需要定义任何配置,因为Akka提供了合理的默认值。不过为了适应特定的运行环境,你可能需要修改设置来更改默认行为。可以修改的典型设置的例子: 日志级别和后端记录器 启用远程 消息序列化 路由器定义 调度的调整 Akka使用Typesafe配置库,它同样也是你自己的应用或库的不错选择,不管你用不用Akka。这...
multipleParameters("a","b","c")//WrappedArray(a, b, c)/** * 必须使用一个函数指向一个匿名函数 * 多数在方法参数是一个函数的时候传递一个参数 * @return */defanonymousFunction= (a:Int,b:Int)=>{ a+b }//调用的时候,println(anonymousFunction(8,6))/** * 嵌套函数的写法 * @param x ...
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Tuples are a good data structure to pack up multiple variables to return from a function, without the need to define a helper class to do so. Slightly syntax to create them, as well as to access the elements contained therein. // Explicitly create the tuple; never really a need to do...
function body return [expr] } 在这里,返回类型可以是任何有效的scala数据类型,参数列表将是用逗号和参数,返回值类型列表分离变量是可选的。非常类似于Java,一个返回语句可以在函数表达式可用情况下返回一个值。以下是这将增加两个整数并返回的函数: object add{ ...
Default values are used when you do not provide values of arguments. Otherwise it uses values that you provide while method call. You can use default values for any number of parameters. So method calls with less number of arguments.
If the map contains the key, the function will return true otherwise false. Exampleobject MyClass { def main(args: Array[String]): Unit = { var map = scala.collection.mutable.Map[Int, String](1->"Akash" , 2->"Ram", 3->"Kiran" ) if(map.contains(1)){ println("value "+map(1...
Tuples are only possible when there are multiple values. If there is only one field in the form, use Forms.single to map to a single value without the overhead of a case class or tuple:val singleForm = Form( single( "email" -> email ) ) val emailValue = singleForm.bind(Map("...
flatMap is the classic Scala flatMap function. Rewriting the Reads[T] with JsResult[A]The Reads[A] API returning a JsResult, you can’t write your Reads[A] as before as you must return a JsResult gathering all found errors.You could imagine simply compose Reads[T] with flatMap :...