// Scala program to add elements to the// Map collectionobjectSample{// Main methoddefmain(args:Array[String]){varstudents=Map((101,"Amit"),(102,"Arun"),(103,"Anit"))println("Student Information:");for((stuId,stuName)<-students)printf("\tId: %d, Name: %s\n",stuId,stuName);stud...
toAdd).map { _ => responseObserver.onNext(SumResponse().withCurrentResult(currentSum.incrementAndGet())) } Thread.sleep(1000) //delay and then finish responseObserver.onCompleted() } } 这个addOneToMany服务函数把 1-request.toAdd之间的数字逐个通过responseObserver返还调用方。 在客户端如下调用服务:...
defmain(args: Array[String]): Unit = { val add1=add(20,1) val add2=add(10,1) println(add1 (2,3))// 5println(add2 (2,3))// 6} defadd(x:Int,y:Int): (Int,Int) => Int = {if(x>10){return{(x,y) => x+y} }else{return{(x,y) => x*y} } } 这样就把函数变...
在scala中,Map也分为不可变Map和可变Map。 不可变Map 语法 代码语言:javascript 复制 val/var map = Map(键->值, 键->值, 键->值...) // 推荐,可读性更好 val/var map = Map((键, 值), (键, 值), (键, 值), (键, 值)...) 参考代码 代码语言:javascript 复制 scala> val map = Map...
1. 不可变Map 2. 可变Map 五、元组 1. 创建元组 2. 遍历元组 3. 增删改查 4. 嵌套元组 六、集合操作 1. 通用操作 2. 衍生操作 3. 两个集合操作 4. 集合函数 七、集合高级函数* 1. 过滤-filter 2. 映射-map 3. 扁平化-flat 4. 扁平化映射-flatmap 5. 分组-group 6. 归约聚合-reduce 7. ...
43 /** 44 * Map基本添加,删除操作 45 */ 46 val map = Map.empty[String, String] 47 val add = Map.empty[String, String] 48 add("Java") = "Hadoop" 49 add("Python") = "Numpy" 50 map("Scala") = "Spark" // 添加单条数据 51 map ++= add // 添加多条数据 52 println(map) 53...
(Ljava/lang/Object;)Ljava/lang/Object;, implementation=invokeStatic org/apache/spark/graphx/impl/VertexRDDImpl.$anonfun$mapVertexPartitions$1:(Lscala/Function1;Lscala/collection/Iterator;)Lscala/collection/Iterator;, instantiatedMethodType=(Lscala/collection/Iterator;)Lscala/collection/Iterator;, num...
ReactJS requires users to provide arenderfunction for each component. Therenderfunction should mappropsandstateto a ReactJS's virtual DOM, then ReactJS framework creates a DOM with the same structure as the virtual DOM. Whenstatechanges, ReactJS framework invokesrenderfunction to get a new virtua...
4.1 常见的高阶函数map def main(args: Array[String]): Unit = { var seqno = Seq(1,2,3) val values = seqno.map(x => x * x) for ( x <- values ){ println(x ) } // 1 // 4 // 9 } 4.2 简化涨薪策略代码 //定义加薪的规则 ...
Map可以称之为映射。它是由键值对组成的集合。在scala中,Map也分为不可变Map和可变 Map。 不可变Map val/var map = Map(键->值, 键->值, 键->值...) // 推荐,可读性更好 val/var map = Map((键, 值), (键, 值), (键, 值), (键, 值)...) 示例 ...