我在Scala中有两个数字相同的数组
val v = myGraph.vertices.collect.map(_._1)
给出:
Array[org.apache.spark.graphx.VertexId] = Array(-7023794695707475841, -44591218498176864, 757355101589630892, 21619280952332745)
和另一个
val w = myGraph.vertices.collect.map(_._2._2)
给出:
Array[String] = Array(2, 3, 1, 2)
我想用
创建一个字符串val z = v.map("{id:" + _ + "," + "group:" + "1" + "}").mkString(",")
给出:
String = {id:-7023794695707475841,group:1},{id:-44591218498176864,group:1},{id:757355101589630892,group:1},{id:21619280952332745,group:1}
但是现在不是硬编码的" 1",而是想要映射w数组中的数字来给出:
String = {id:-7023794695707475841,group:2},{id:-44591218498176864,group:3},{id:757355101589630892,group:1},{id:21619280952332745,group:2}
我该怎么做?
答案 0 :(得分:2)
Scala集合中有一个名为zip的方法,它可以按照您需要的方式将两个集合配对。
val v = Array(-37581, -44864, 757102, 21625)
val w = Array(2, 3, 1, 2)
val z = v.zip(w).map {
case (v, w) => "{id:" + v + "," + "group:" + w + "}"
}.mkString(",")
值z
变为:
{id:-37581,group:2},{id:-44864,group:3},{id:757102,group:1},{id:21625,group:2}